Geologic Map of the Amboy Quadrangle, Clark and Cowlitz Counties, Washington

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Russell C. Evarts

Originator: Philip Dinterman (database)

Publication_Date: 2005

Title:

Geologic Map of the Amboy Quadrangle, Clark and Cowlitz Counties, Washington

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage: <https://pubs.usgs.gov/sim/2005/2885>

Description:

Abstract:

This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits of the Amboy 7.5-minute quadrangle. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000 or smaller.

Purpose:

This database and accompanying plot files depict the distribution of geologic materials and structures at a regional (1:24,000) scale. The report is intended to provide geologic information for the regional study of materials properties, earthquake shaking, landslide potential, mineral hazards, seismic velocity, and earthquake faults. In addition, the report contains new information and interpretations about the regional geologic history and framework. However, the regional scale of this report does not provide sufficient detail for site development purposes.

Supplemental_Information:

DIGITAL COMPILATION-Several different feature classes were generated within a geodatabase during the construction of the Amboy quadrangle geologic map. The topographic base map remains as a digital raster graphic (DRG) and is overlain on the geology feature class in ArcMap at a 60% transparency level. Some custom menus were used to project, transform, edit, tag, and build points in the map. A digital layout or map collar was made with Adobe Illustrator. The map was exported from the layout view in ArcMap as an Adobe Illustrator file and added to a single Adobe Illustrator file that also contained the description of map units, correlation of map units, cross sections, and an index map. Differences between the maps as they appear in the final map sheet and as they appear in the either the .mxd or .pmf files represent changes made in the Adobe Illustrator file to the symbology only and do not reflect any changes in the actual source data. The map is in UTM projection, zone 10, meters, and 1:24,000 scale. The explanatory pamphlet was saved to PDF from Microsoft Word.

BASE MAP-The base map for the digital compilation is a Digital Raster Graphic (DRG) of the U.S. Geological Survey, 1:24,000-scale topographic map of the Amboy 7.5' quadrangle (1990), which has a 20-foot contour interval. The image inside the map neatline is georeferenced to the Universal Transverse Mercator projection, zone 10. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map. The base map layer is a digital image, but no information other than location is attached to the lines. The base map is provided for reference only.

SPATIAL RESOLUTION-Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited at a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.501122

East_Bounding_Coordinate: -122.373594

North_Bounding_Coordinate: 46.000616

South_Bounding_Coordinate: 45.874385

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Cascade Range

Theme_Keyword: Portland Basin

Theme_Keyword: Mount St. Helens

Theme_Keyword: Ar/Ar Geochronology

Theme_Keyword: glacial geology

Theme_Keyword: Hayden Creek Drift

Theme_Keyword: Elkhorn Mountain

Place:

Place_Keyword: Pacific Northwest

Place_Keyword: Washington

Place_Keyword: Cowlitz County

Place_Keyword: Clark County

Stratum:

Stratum_Keyword: Troutdale Formation

Stratum_Keyword: Tertiary volcanic stratigraphy

Stratum_Keyword: intrusive rocks

Access_Constraints: None

Use_Constraints:

Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:

Lineage:

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: C:\DOCUME~1\PHILIP~1\LOCALS~1\Temp\xml15C.tmp

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 1724

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Transverse Mercator

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -123.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000065

Ordinate_Resolution: 0.000065

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: D_Clarke_1866

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.400000

Denominator_of_Flattening_Ratio: 294.978698

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Resolution: 0.000010

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyContacts

Entity_Type_Definition: Geologic contacts

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FNODE_

Attribute_Definition: Internal node number for the beginning of an arc (from-node).

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: TNODE_

Attribute_Definition: Internal node number for the end of an arc (to-node).

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: LPOLY_

Attribute_Definition: Internal node number for the left polygon.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: RPOLY_

Attribute_Definition: Internal node number for the right polygon.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: LENGTH

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: LTYPE

Attribute_Definition: Geologic contact description

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: contact, approx. located

Enumerated_Domain_Value_Definition:

Approximately located boundary between geologic units; positional accuracy generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: contact, certain

Enumerated_Domain_Value_Definition:

Boundary between geologic units, positional accuracy generally within 2 mm at 1:24,000 (48 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: contact, concealed

Enumerated_Domain_Value_Definition:

Boundary between geologic units that is concealed by a younger unit; positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: contact, inferred

Enumerated_Domain_Value_Definition:

Boundary of uncertain location between geologic units; positional accuracy uncertain contact exists but location inferred from indirect evidence

Enumerated_Domain:

Enumerated_Domain_Value: fault, approx. located

Enumerated_Domain_Value_Definition:

Trace of approximately located fault positional accuracy generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: fault, certain

Enumerated_Domain_Value_Definition:

Trace of fault, positional accuracy generally within 2 mm at 1:24,000 (48 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: fault, concealed

Enumerated_Domain_Value_Definition:

Trace of fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: map boundary

Enumerated_Domain_Value_Definition: map boundary of this 1:24000 study

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, approx. located

Enumerated_Domain_Value_Definition:

Trace of approximately located normal fault positional accuracy generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, approx. located_mN

Enumerated_Domain_Value_Definition:

Trace of approximately located normal fault positional accuracy generally within 5 mm at 1:24,000 (120 m on the ground), marker symbol showing downdip direction towards north

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, approx. located_mS

Enumerated_Domain_Value_Definition:

Trace of approximately located normal fault positional accuracy generally within 5 mm at 1:24,000 (120 m on the ground), marker symbol showing downdip direction towards south

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, concealed

Enumerated_Domain_Value_Definition:

Trace of normal fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, concealed, queried

Enumerated_Domain_Value_Definition:

Trace of possible normal fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, concealed_mN

Enumerated_Domain_Value_Definition:

Trace of normal fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground), marker symbol showing downdip direction towards north

Enumerated_Domain:

Enumerated_Domain_Value: normal fault, concealed_mS

Enumerated_Domain_Value_Definition:

Trace of normal fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground), marker symbol showing downdip direction towards south

Enumerated_Domain:

Enumerated_Domain_Value: s.s. fault, l.l., concealed

Enumerated_Domain_Value_Definition:

Trace of left lateral strike-slip fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: s.s. fault, l.l., concealed_m

Enumerated_Domain_Value_Definition:

Trace of left lateral strike-slip fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground) with marker

Enumerated_Domain:

Enumerated_Domain_Value: s.s. fault, r.l., concealed

Enumerated_Domain_Value_Definition:

Trace of right lateral strike-slip fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground)

Enumerated_Domain:

Enumerated_Domain_Value: s.s. fault, r.l., concealed_m

Enumerated_Domain_Value_Definition:

Trace of right lateral strike-slip fault concealed by younger unit positional accuracy uncertain but probably generally within 5 mm at 1:24,000 (120 m on the ground) with marker

Enumerated_Domain:

Enumerated_Domain_Value: water boundary, certain

Enumerated_Domain_Value_Definition:

Outline of a body of open water; positional accuracy within 1:24,000 National Map Accuracy Standards

Attribute:

Attribute_Label: Shape_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyGeologyPolys

Entity_Type_Definition: Geologic Unit Descriptions

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: AREA

Attribute_Definition: Internal node number for the beginning of an arc (from-node).

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition: Internal node number for the end of an arc (to-node).

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: PTYPE

Attribute_Definition: Geologic unit description

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: af

Enumerated_Domain_Value_Definition:

Artificial fill (Holocene)Unconsolidated soil, sand, gravel, and crushed rock used primarily to construct dams impounding small streams in southwest part of quadrangle

Enumerated_Domain:

Enumerated_Domain_Value: Qa

Enumerated_Domain_Value_Definition:

Alluvium (Holocene and Pleistocene)Unconsolidated silt, sand, and gravel along Speelyai, Buncombe Hollow, and Cedar Creeks and smaller streams; poorly sorted to well-sorted, crudely stratified to well laminated, locally cross-stratified. Unit includes small alluvial fans along south shore of Lake Merwin

Enumerated_Domain:

Enumerated_Domain_Value: Qt

Enumerated_Domain_Value_Definition:

Talus deposits (Holocene and Pleistocene)Unsorted accumulations of angular bedrock blocks, some as large as 5 m across. Chiefly rockfall and rock-avalanche deposits. Largest deposits cover lower parts of glacially steepened slopes such as the north face of Green Mountain, east face of Dunegan Mountain, south wall of Speelyai Creek valley and south side of Chelatchie Prairie

Enumerated_Domain:

Enumerated_Domain_Value: Qls

Enumerated_Domain_Value_Definition:

Landslide deposits (Holocene and Pleistocene)Diamictons of angular bedrock and (or) surficial material transported down slope en masse. Chiefly deep-seated, semi-coherent slumps and internally disrupted rockslide, earthflow, and debris-flow deposits. Many mapped slides head at arcuate scars and exhibit subhorizontal tops, bulbous toes, and hummocky, poorly drained surfaces

Enumerated_Domain:

Enumerated_Domain_Value: Ql

Enumerated_Domain_Value_Definition:

Lake deposits (Holocene and Pleistocene)Thin-bedded to finely laminated, clay, silt, and fine-grained sand; dark-gray to black, locally organic rich. Underlie small area in southwest part of map area that is east end of drained Fargher Lake of Ariel quadrangle (Evarts, 2004b); tephrochronology, radiocarbon ages, and pollen analysis indicate these deposits range in age from about 20,000 to at least 55,000 years old (Grigg and Whitlock, 2002). Small unmapped outcrops of lake beds locally present along Cedar Creek, shore of Lake Merwin, and on west flank of Dunegan Mountain

Enumerated_Domain:

Enumerated_Domain_Value: Qsc

Enumerated_Domain_Value_Definition:

Deposits of Mount St. Helens volcanic center Deposits of Cougar eruptive stage (Pleistocene)Complex assemblage of unconsolidated sand and gravel predominantly composed of dacitic debris from Mount St. Helens. Forms fill at least 70 m thick in valley of Speelyai Creek; thinner deposits locally exposed along shores of Lake Merwin from Woodland Park eastward, unconformably overlying Amboy Drift (Qat and Qao). Consists of poorly sorted pebbly to bouldery lahar and lahar-runout deposits interbedded with alluvium (Major and Scott, 1988). Most beds contain clasts of light-colored, coarsely porphyritic quartz-biotite dacite, hornblende-cummingtonite dacite, and hypersthene-hornblende dacite similar to that erupted prior to and during the Cougar eruptive stage (M.A. Clynne, oral communication, 2002), about 21,000-18,000 14C years B.P. (Crandell, 1987). Major and Scott (1988) obtained an age of 22,720±1,400 14C years B.P. from charcoal in alluvium near top of the Speelyai fill, consistent with a Cougar age

Enumerated_Domain:

Enumerated_Domain_Value: Qsa

Enumerated_Domain_Value_Definition:

Deposits of Mount St. Helens volcanic center Deposits of Ape Canyon eruptive stage (Pleistocene)Unconsolidated sand and gravel consisting largely of light-colored, quartz- and biotite-bearing dacite clasts; exposed along north shore of Lake Merwin west of Woodland Park and in dissected terrace near east end of the lake. Overlies Amboy drift (Qat and Qao). At mouth of Rock Creek, includes poorly sorted bed probably deposited by debris flow; exposure to west consists of 10-12 m of stratified pebbly pumiceous gravel and sand of alluvial origin (Major and Scott, 1988). Poorly exposed area east of Lake Merwin includes several meters of tephra as well as sandy alluvium. All clasts in these deposits are derived from distinctive, coarsely porphyritic, quartz- and biotite-bearing dacite of the kind erupted from Mount St. Helens during the Ape Canyon eruptive stage (approximately 36,000 to 50,000 14C years B.P. according to Crandell, 1987) and at earlier times (Evarts and others, 2003)

Enumerated_Domain:

Enumerated_Domain_Value:

Glacial deposits (Qao, Qat, and Qmt, individual unit descriptions follow this overall descrition)

Enumerated_Domain_Value_Definition:

Amboy Drift (Pleistocene)Moderately weathered till and glaciofluvial deposits (Mundorff, 1984) characterized by weathering profiles about 2 m thick, development of weathering rinds 1 to 2 mm thick on aphanitic andesitic clasts in upper part, and, in northern part of map area, widespread presence of quartz-, biotite, and cummingtonite-bearing dacite clasts derived from the ancestral volcanic center at Mount St. Helens. Based on weathering characteristics, Amboy Drift is correlative with Hayden Creek Drift, which Crandell and Miller (1974) interpreted to be the product of the penultimate glaciation in the Washington Cascade Range. Age poorly known; estimates range from about 50 ka to greater than 300 ka (Crandell and Miller, 1974; Crandell, 1987; Colman and Pierce, 1981; Dethier, 1988, Grigg and Whitlock, 2002, Evarts, 2004b); plagioclase from tephra bed beneath till near crest of Green Mountain yielded 40Ar/39Ar age of 250±36 ka (table 2)

Enumerated_Domain:

Enumerated_Domain_Value: Qao

Enumerated_Domain_Value_Definition:

OutwashPoorly consolidated pebbly to cobbly gravel and sand that underlies Chelatchie Prairie and semi-continuous terrace remnants above floodplain of Cedar Creek. As thick as 66 m beneath Chelatchie Prairie. Deposits moderately weathered, crudely stratified, moderately sorted to well sorted; commonly weakly cemented by limonite or clay. Composed mostly of well-rounded clasts of diverse volcanic rocks, some with grooved or striated surfaces, similar to those in associated till (Qat). Interpreted as glaciofluvial deposits deposited during retreat of Lewis River glacier in late Pleistocene time. Terrace surfaces along Cedar Creek near south boundary of quadrangle are about 90 m higher than Chelatchie Prairie and form the north end of south-sloping valley fill that must be somewhat older than outwash to north

Enumerated_Domain:

Enumerated_Domain_Value: Qat

Enumerated_Domain_Value_Definition:

TillUnconsolidated to compact, massive diamicton mantling much of map area to elevations as high as 1850 ft (560 m). As much as 15 m thick; in several places observed to rest on surface of glacially smoothed and striated bedrock. Consists of angular to rounded clasts up to boulder size, some grooved or striated, dispersed in matrix of sand, silt, and clay; locally includes stratified drift, ice-contact deposits, outwash, lake deposits, loess, and postglacial colluvium. Unoxidized till light brownish- to bluish-gray. Composed chiefly of diverse volcanic rocks similar to Tertiary rocks of the western Cascade Range, but locally contains clasts similar to middle Pleistocene olivine-phyric basalts and basaltic andesites erupted from monogenetic vents in the Lewis drainage upstream from quadrangle (Evarts and Ashley, 1990a, 1991); conspicuous light-colored clasts of coarsely porphyritic quartz-, cummingtonite-, and biotite-bearing dacite of the type erupted from the ancestral Mount St. Helens volcanic center (Crandell, 1987) are a minor component in some till, especially north of Lake Merwin

Enumerated_Domain:

Enumerated_Domain_Value: Qmt

Enumerated_Domain_Value_Definition:

Drift of Mason Creek (Pleistocene)Highly weathered, reddish-brown, bouldery till and gravel in southwest part of map area. Weathering rinds on aphanitic andesitic clasts as thick as 1 cm or more; some clasts as large as 8 cm across completely decomposed. Similar to informal drift of Mason Creek in adjacent Ariel quadrangle (Evarts, 2004b)

Enumerated_Domain:

Enumerated_Domain_Value: Tdi

Enumerated_Domain_Value_Definition:

Diorite (Miocene and (or) Oligocene)Scattered small intrusions, chiefly sills, of fine- to medium-grained, light- to dark-green pyroxene diorite and microdiorite. Unit includes medium-grained hypidiomorphic granular rocks and finer grained aphyric and porphyritic rocks with pronounced fabrics. Composed of plagioclase, augite, hypersthene, and Fe-Ti oxide accompanied by less than 10 percent interstitial quartz; amygdules or miarolitic cavities locally common. Slight to intense deuteric alteration to zeolites, carbonates, and clay minerals

Enumerated_Domain:

Enumerated_Domain_Value: Tdic

Enumerated_Domain_Value_Definition:

Diorite of Chelatchie Prairie (Miocene or Oligocene)Plug-like intrusion of fine- to medium-grained, seriate, hypersthene quartz diorite underlying conical hill at southwest end of Chelatchie Prairie. Contains phenocrysts of plagioclase (about 25-30 percent; up to 3 mm long), hypersthene (2-3 percent; 1 mm across), and sparse augite (<0.5 percent; 1 mm across), in a coarse-grained intergranular groundmass of plagioclase, pyroxene and Fe-Ti oxide

Enumerated_Domain:

Enumerated_Domain_Value: Tdid

Enumerated_Domain_Value_Definition:

Diorite of Dunegan Mountain (Miocene or Oligocene)Complex sill-like(?) intrusion of augite diorite centered on Dunegan Mountain; massive, blocky-jointed, dark greenish gray, weathering to light gray. Medium- to coarse-grained, seriate to hypidiomorphic granular rock composed of plagioclase (about 60-65 percent; 1-2 mm across; partly replaced by stilbite and smectite), augite (about 15-20 percent; 0.5-1 mm across), Fe-Ti oxide (about 3 percent; 0.25 mm across), and interstitial quartz typically intergrown with fine-grained feldspar (about 15-20 percent) and enclosing apatite needles

Enumerated_Domain:

Enumerated_Domain_Value: Tdib

Enumerated_Domain_Value_Definition:

Diorite of Buncombe Hollow (Miocene or Oligocene)Large, multiphase, sill-like intrusion, nearly 150 m thick, of pyroxene diorite and microdiorite exposed on ridge between Lake Merwin and Buncombe Hollow Creek. Mostly dark- to medium-gray or greenish-gray, medium- to fine-grained, porphyritic to seriate rocks composed of plagioclase (50-60 percent; 1-3 mm long), augite (as much as 20 percent; 0.5 -1 mm across), hypersthene (0-6 percent; 0.5-1 mm across), olivine (0-3 percent; 0.5 -1 mm across; totally altered to smectite, serpentine, calcite), and Fe-Ti oxide (1-2 percent; 0.2-0.5 mm across) with minor interstitial quartz, smectite, and local traces of brown hornblende; some phases of intrusion coarser grained, with crystals of plagioclase as long as 8 mm and pyroxene as large as 3 mm across

Enumerated_Domain:

Enumerated_Domain_Value: Tib

Enumerated_Domain_Value_Definition:

Intrusive basalt (Eocene)Dike of olivine-phyric basalt exposed in roadcut along State Route 503 directly west of Rock Creek; petrographically similar to and possibly feeder for nearby flow of olivine-phyric basalt (Tob)

Enumerated_Domain:

Enumerated_Domain_Value: Tiba

Enumerated_Domain_Value_Definition:

Intrusive basaltic andesite (Eocene)Several dikes of nearly aphyric basaltic andesite, as wide as 7 m, exposed in roadcut along State Route 503 west of mouth of Speelyai Creek, and a similar dike near mouth of Rock Creek. Contain sparse plagioclase phenocrysts and olivine and augite microphenocrysts in trachytic to pilotaxitic groundmass

Enumerated_Domain:

Enumerated_Domain_Value: Tia

Enumerated_Domain_Value_Definition:

Intrusive andesite (Eocene)Dike of sparsely porphyritic andesite cutting volcaniclastic rocks along south shore of Lake Merwin. Contains phenocrysts of plagioclase (1.9 percent; 0.5 to 1 mm long), augite (0.5 percent; 0.5 to 1 mm across), and hypersthene (0.2 percent; 0.5 mm long) and microphenocrysts of Fe-Ti oxide in a microphyric, pilotaxitic groundmass

Enumerated_Domain:

Enumerated_Domain_Value: Tbem, Tbem?

Enumerated_Domain_Value_Definition:

Basaltic andesite of Elkhorn Mountain (Oligocene)Sequence of tholeiitic basaltic andesite and basalt flows and flow breccia in southern part of quadrangle; unit extends about 65 km south to Camas (R.C. Evarts, unpub. mapping). Flows are dark-gray to brown, porphyritic to seriate to aphyric, locally columnar-jointed, typically about 5-8 m thick. Typical porphyritic flows contain phenocrysts and glomerocrysts of weakly zoned plagioclase (0-45 percent; 1 to 6 mm, locally more than 10 mm long; variably replaced by zeolites and (or) clay) and olivine (<3 percent; 0.5 to 1 mm across; commonly partly resorbed and surrounded by rinds of granular pyroxene and (or) magnetite; invariably replaced by some combination of smectite, hematite, carbonate, serpentine, quartz and kaolinite). Some flows also contain phenocrysts of augite (<2 percent; 0.5 to 3 mm across) and microphenocrysts of Fe-Ti oxide; a few also contain phenocrysts of hypersthene, (<1 percent; 0.5 to 1 mm long). Groundmass consists of plagioclase, augite, Fe-Ti oxide, and minor to abundant interstitial glass (generally devitrified or replaced by smectite, quartz, or calcite); groundmass textures chiefly intergranular to trachytic, less commonly subophitic, intersertal, or microphyric. Many flows in unit abundantly plagioclase-phyric, as reflected in Al2O3 contents greater than 19 wt percent, and have probably accumulated excess feldspar. All flows in unit are tholeiitic and relatively poor in Sr (mostly <320 ppm but higher in plagioclase-accumulative lavas) compared to mafic rocks elsewhere in southern Washington Cascade Range (Evarts, 2001, 2002, 2004a, b; R.C. Evarts, unpub. data). Base of unit is slight angular unconformity; whole-rock 40Ar/39Ar ages of approximately 27 Ma were obtained for unit in Yacolt quadrangle to south (R.J. Fleck, written commun., 2005)

Enumerated_Domain:

Enumerated_Domain_Value: Ta, Ta?

Enumerated_Domain_Value_Definition:

Andesite (Oligocene and Eocene)Flows and flow breccia of medium- to dark-gray, variably vesicular, aphyric to porphyritic pyroxene andesite. Unit locally includes small flows of basaltic andesite and dacite and thin volcaniclastic interbeds. Typical andesite contains phenocrysts of plagioclase (1-35 percent; 1-5 mm long), augite (0-5 percent; <0.5 to 3 mm across), hypersthene (0-6 percent; <0.5 to 3 mm long), Fe-Ti oxide (£0.5 percent; <0.5 mm across), and rare altered olivine (£2 percent; as large as 2 mm across) in an intergranular, intersertal, pilotaxitic, hyalopilitic or cryptocrystalline groundmass; some sparsely porphyritic andesites lack augite or hypersthene or both. Alteration similar in mineralogy and intensity to that described for basaltic andesite (Tba)

Enumerated_Domain:

Enumerated_Domain_Value: Tba, Tba?

Enumerated_Domain_Value_Definition:

Basaltic andesite (Oligocene and Eocene)Flows and flow breccia of dark-gray to brown, porphyritic to seriate to aphyric basaltic andesite; unit locally includes minor andesite and basalt flows and volcaniclastic rocks too small or poorly exposed to map. Typical flows contain phenocrysts of plagioclase (0-45 percent; 1-2 mm, rarely to 5 mm long), olivine (as much as 7 percent; 0.5-2 mm across; commonly partly resorbed and surrounded by rinds of granular pyroxene and (or) magnetite; almost invariably replaced by some combination of smectite, hematite, carbonate, serpentine, and quartz; commonly contains minute inclusions of chromian spinel) and augite (as much as 5 percent; 0.5-3 mm across); some flows lack olivine and (or) augite phenocrysts; many contain microphenocrysts of Fe-Ti oxide and a few contain phenocrysts of hypersthene (as much as 2 percent; 0.5-1 mm long). Intergranular to trachytic groundmass consists of the same minerals plus minor interstitial glass (mostly altered to smectitic clay, quartz, or calcite)

Enumerated_Domain:

Enumerated_Domain_Value: Tvs

Enumerated_Domain_Value_Definition:

Volcaniclastic sedimentary rocks (Oligocene and Eocene)Diverse assemblage of continental volcaniclastic rocks of inferred epiclastic origin. Consist of thin- to thick-bedded, well-sorted to poorly sorted siltstone, sandstone, conglomerate, and breccia, all composed of volcanic debris. Locally includes thin beds of pumiceous pyroclastic rocks and lava flows too small or poorly exposed to map. Beds most commonly light green to olive green or greenish-gray but also white, tan, or brown. Texturally and compositionally immature; most abundant clasts are volcanic rocks petrographically similar to interbedded lava flows and tuffs; other components include plagioclase, Fe-Ti oxide, and pyroxene crystals, pumice, vitric ash, fine-grained dioritic rocks, and plant remains. Interpreted as debris eroded from older and penecontemporaneous volcanoes and deposited by normal fluvial and lacustrine processes in low-lying medial to distal intervolcano environments. Typically display intense alteration to assemblages of clay minerals, zeolites (chiefly heulandite-clinoptilolite and laumontite), quartz, calcite, hematite, celadonite

Enumerated_Domain:

Enumerated_Domain_Value: Tt, Tt?

Enumerated_Domain_Value_Definition:

Tuff (Oligocene and Eocene)Heterogeneous unit composed of light-green to brown andesitic to rhyolitic tuff, pumice- and lithic-lapilli tuff, and tuff breccia; very poorly sorted, matrix-supported, relatively coarse-grained deposits predominate; inferred to be mostly of pyroclastic-flow and lahar origin but doubtless includes some airfall tuff and reworked debris. As mapped, includes sequences of tuffaceous rocks interbedded with and gradational to subordinate pumice-poor epiclastic sedimentary rocks. Phenocrysts generally constitute less than 10 percent of juvenile material in tuff, and include plagioclase, augite, hypersthene, and Fe-Ti oxide, but no quartz, amphibole or biotite. Alteration similar in character to that described for volcaniclastic sedimentary rocks (Tvs). Tuff in southern part of quadrangle generally more porphyritic, lithic-poor, and more densely welded than in most other areas; contains as much as 25 percent rounded and broken phenocrysts of plagioclase as well as minor brown hornblende. 40Ar/39Ar ages of 33.4±0.4 Ma and 33.0±0.1 Ma (table 2) were obtained from plagioclase in welded tuffs from southern part of quadrangle

Enumerated_Domain:

Enumerated_Domain_Value: Td

Enumerated_Domain_Value_Definition:

Dacite (Oligocene and Eocene)Scattered flows and flow breccia of variably porphyritic dacite; platy, typically flow-banded, and commonly vesicular; largely restricted to south half of quadrangle. Contain phenocrysts of plagioclase (5-20 percent; 1-3 mm long) and, in most samples, hypersthene (1-2 percent; 0.5-1 mm long), and augite (£2 percent; 0.5-1 mm across), and microphenocrysts of Fe-Ti oxide (<0.5 percent) in a pilotaxitic, hyalopilitic, cryptocrystalline, or spherulitic groundmass. Commonly exhibits minor to pervasive low-temperature alteration, which imparts green, pink, purple, and brown colors; fine-grained alteration assemblages include quartz, calcite, albite, clinoptilolite, hematite, montmorillonite, kaolinite, and titanite

Enumerated_Domain:

Enumerated_Domain_Value: Tdpo

Enumerated_Domain_Value_Definition:

Tuff of Davis Peak, outflow facies (Eocene)Bed of porphyritic, densely welded, dacitic tuff exposed on south side of Cedar Creek at west edge of map area. As much as 30 m or more thick. Interpreted as outflow facies of pyroclastic deposits filling Davis Peak caldera in adjacent Ariel quadrangle, where an 40Ar/39Ar age of 35.1±0.3 Ma was obtained from this unit (Evarts, 2004b)

Enumerated_Domain:

Enumerated_Domain_Value: Tob

Enumerated_Domain_Value_Definition:

Olivine basalt (Eocene)Dark-gray, porphyritic to seriate basalt with olivine as the sole or dominant phenocryst phase. Olivine phenocrysts (as much as 10 percent; 0.5-3.0 mm across) partly to completely replaced by smectite ± hematite; contain numerous tiny octahedral chromian spinel inclusions. Some samples also contain a few plagioclase phenocrysts. Intergranular to trachytic groundmass composed of plagioclase, augite, Fe-Ti oxide, and interstitial glass devitrified or altered to smectite; groundmass of one flow (table 1, no. 1) contains fine-grained phlogopite. Smectite and zeolite fill irregular microvesicles. Lenticular exposure, as thick as 150 m, on north slope of Green Mountain includes abundant brick-red scoriaceous agglomerate

Enumerated_Domain:

Enumerated_Domain_Value: Tb

Enumerated_Domain_Value_Definition:

Basalt (Eocene)Isolated flows of aphyric to porphyritic plagioclase-phyric basalt in northern part of quadrangle. Porphyritic flows contain phenocrysts of plagioclase (as much as 20 percent; 1-3 mm long) and olivine (to 3 percent; 1-3 mm across; contains small inclusions of chromian spinel) in intergranular to trachytic groundmass of feldspar, augite, Fe-Ti oxide, minor olivine, and interstitial smectite

Enumerated_Domain:

Enumerated_Domain_Value: Tppb

Enumerated_Domain_Value_Definition:

Plagioclase-phyric basalt (Eocene)Flow of distinctive, dark-gray, coarsely and densely porphyritic basalt cropping out on steep valley walls of Speelyai Creek; as much as 30 m thick and more than 4 km long. Contains abundant large phenocrysts of plagioclase (15-45 percent; up to 10 mm long) and altered olivine (<0.5 percent; 1-2 mm across) in coarse-grained intergranular groundmass of feldspar, pyroxene, Fe-Ti oxide, minor altered olivine, and interstitial smectite

Enumerated_Domain:

Enumerated_Domain_Value: water

Enumerated_Domain_Value_Definition: present water, geology not mapped beneath

Attribute:

Attribute_Label: Style

Attribute:

Attribute_Label: Shape_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: Shape_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_12_47

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyGeologyPolysAnno

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FeatureID

Attribute:

Attribute_Label: ZOrder

Attribute:

Attribute_Label: AnnotationClassID

Attribute:

Attribute_Label: Element

Attribute:

Attribute_Label: SHAPE_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_12_47

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyStrucLines

Entity_Type_Definition: Structural Line Features

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: LTYPE

Attribute_Definition: Structural Line Type

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: dike, andesite

Enumerated_Domain_Value_Definition:

Intrusive andesite (Eocene)Dike of sparsely porphyritic andesite cutting volcaniclastic rocks along south shore of Lake Merwin. Contains phenocrysts of plagioclase (1.9 percent; 0.5 to 1 mm long), augite (0.5 percent; 0.5 to 1 mm across), and hypersthene (0.2 percent; 0.5 mm long) and microphenocrysts of Fe-Ti oxide in a microphyric, pilotaxitic groundmass

Enumerated_Domain:

Enumerated_Domain_Value: dike, bas. andesite

Enumerated_Domain_Value_Definition:

Intrusive basaltic andesite (Eocene)Several dikes of nearly aphyric basaltic andesite, as wide as 7 m, exposed in roadcut along State Route 503 west of mouth of Speelyai Creek, and a similar dike near mouth of Rock Creek. Contain sparse plagioclase phenocrysts and olivine and augite microphenocrysts in trachytic to pilotaxitic groundmass

Enumerated_Domain:

Enumerated_Domain_Value: dike, basaltic

Enumerated_Domain_Value_Definition:

Intrusive basalt (Eocene)Dike of olivine-phyric basalt exposed in roadcut along State Route 503 directly west of Rock Creek; petrographically similar to and possibly feeder for nearby flow of olivine-phyric basalt (Tob)

Attribute:

Attribute_Label: SHAPE_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyCrossSectionLines

Entity_Type_Definition: Location of Cross Section

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Attribute:

Attribute_Label: FNODE_

Attribute_Definition: Internal node number for the beginning of an arc (from-node).

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: TNODE_

Attribute_Definition: Internal node number for the end of an arc (to-node).

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: LPOLY_

Attribute_Definition: Internal node number for the left polygon.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: RPOLY_

Attribute_Definition: Internal node number for the right polygon.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Whole numbers that are automatically generated.

Attribute:

Attribute_Label: LENGTH

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: LTYPE

Attribute_Definition: Cross Section Line

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: cross section

Enumerated_Domain_Value_Definition: Location of Author's Cross Section

Attribute:

Attribute_Label: Shape_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyStrucPoints

Entity_Type_Definition: Geologic Bedding Description

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: AREA

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Area is always zero for point coverages. Values are automatically generated.

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition: Perimeter of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Perimeter is always zero for point coverages. Values are automatically generated.

Attribute:

Attribute_Label: PTTYPE

Attribute_Definition: Geologic Bedding Description

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: bedding

Enumerated_Domain_Value_Definition: Strike and dip of beds

Enumerated_Domain:

Enumerated_Domain_Value: igneous foliation

Enumerated_Domain_Value_Definition:

Strike and dip of compaction foliation in pumiceous lapilli tuff

Enumerated_Domain:

Enumerated_Domain_Value: inclined cleavage

Enumerated_Domain_Value_Definition: Strike and dip of platy parting in lava flows

Attribute:

Attribute_Label: STRIKE

Attribute_Definition: Strike of beds

Attribute:

Attribute_Label: DIP

Attribute_Definition: Dip of beds

Attribute:

Attribute_Label: POLYGONID

Attribute:

Attribute_Label: SCALE

Attribute:

Attribute_Label: ANGLE

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_13_31

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyStrucPointsAnno

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FeatureID

Attribute:

Attribute_Label: ZOrder

Attribute:

Attribute_Label: AnnotationClassID

Attribute:

Attribute_Label: Element

Attribute:

Attribute_Label: SHAPE_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_13_31

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyChemistryMapPoints

Entity_Type_Definition: Chemical Data for points on map

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: MAP_NO

Attribute_Definition: Number designation on map

Attribute:

Attribute_Label: SAMPNO

Attribute_Definition: Sample number used in field collection

Attribute_Definition_Source: Author

Attribute:

Attribute_Label: PLOT

Attribute_Definition: Designation if point will be plotted

Attribute:

Attribute_Label: MAP_UNIT

Attribute_Definition: Geologic unit sample is located within

Attribute:

Attribute_Label: ROCK_TYPE

Attribute_Definition: Physical type of rock from which sample was taken

Attribute:

Attribute_Label: SIO2

Attribute_Definition: Silicon concentration expressed as weight percent oxide

Attribute:

Attribute_Label: TIO2

Attribute_Definition: Titanium concentration expressed as weight percent oxide

Attribute:

Attribute_Label: AL2O3

Attribute_Definition: Aluminum concentration expressed as weight percent oxide

Attribute:

Attribute_Label: FEO_

Attribute_Definition: Ferrous iron concentration expressed as weight percent oxide

Attribute:

Attribute_Label: MNO

Attribute_Definition: Manganese concentration expressed as weight percent oxide

Attribute:

Attribute_Label: MGO

Attribute_Definition: Magnesium concentration expressed as weight percent oxide

Attribute:

Attribute_Label: CAO

Attribute_Definition: Calcium concentration expressed as weight percent oxide

Attribute:

Attribute_Label: NA2O

Attribute_Definition: Sodium concentration expressed as weight percent oxide

Attribute:

Attribute_Label: K2O

Attribute_Definition: Potassium concentration expressed as weight percent oxide

Attribute:

Attribute_Label: P2O5

Attribute_Definition: Phosphorous concentration expressed as weight percent oxide

Attribute:

Attribute_Label: TOTAL

Attribute_Definition: Total of weight percent oxides

Attribute:

Attribute_Label: SIO2_N

Attribute_Definition:

Silicon expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: TIO2_N

Attribute_Definition:

Titanium expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: AL2O3_N

Attribute_Definition:

Aluminum expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: FEO__N

Attribute_Definition:

Ferrous Iron expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: MNO_N

Attribute_Definition:

Manganese expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: MGO_N

Attribute_Definition:

Magnesium expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: CAO_N

Attribute_Definition:

Calcium expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: NA2O_N

Attribute_Definition:

Sodium expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: K2O_N

Attribute_Definition:

Potassium expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: P2O5_N

Attribute_Definition:

Phosphorous expressed as weight percent oxide from analysis recalculated volatile-free

Attribute:

Attribute_Label: MG_

Attribute_Definition: Atomic ratio 100Mg/(Mg+Fe2+) with Fe2+ set to 0.85x Fetotal

Attribute:

Attribute_Label: PLAGIOCLAS

Attribute_Definition: Modal percent plagioclase phenocrysts

Attribute:

Attribute_Label: CLINOPYROX

Attribute_Definition: Modal percent clinopyroxene phenocrysts

Attribute:

Attribute_Label: ORTHOPYROX

Attribute_Definition: Modal percent orthopyroxene phenocrysts

Attribute:

Attribute_Label: OLIVINE

Attribute_Definition: Modal percent olivine phenocrysts

Attribute:

Attribute_Label: FE_TI_OXID

Attribute_Definition: Modal percent iron-oxide phenocrysts

Attribute:

Attribute_Label: HORNBLENDE

Attribute_Definition: Modal percent hornblende phenocrysts

Attribute:

Attribute_Label: QUARTZ

Attribute_Definition: Modal percent quartz phenocrysts

Attribute:

Attribute_Label: K_FELDSPAR

Attribute_Definition: Modal percent K-feldspar phenocrysts

Attribute:

Attribute_Label: OTHER

Attribute_Definition: Modal percent other phenocrysts

Attribute:

Attribute_Label: GROUNDMASS

Attribute_Definition: Modal percent of groundmass

Attribute:

Attribute_Label: NO__POINTS

Attribute_Definition: Number of points counted for modes

Attribute:

Attribute_Label: TEXTURE

Attribute_Definition: Rock and groundmass texture

Attribute:

Attribute_Label: BA

Attribute_Definition: Barium concentration in parts per million

Attribute:

Attribute_Label: RB

Attribute_Definition: Rubidium concentration in parts per million

Attribute:

Attribute_Label: SR

Attribute_Definition: Strontium concentration in parts per million

Attribute:

Attribute_Label: Y_1

Attribute_Definition: Yttrium concentration in parts per million

Attribute:

Attribute_Label: ZR

Attribute_Definition: Zirconium concentration in parts per million

Attribute:

Attribute_Label: NB

Attribute_Definition: Niobium concentration in parts per million

Attribute:

Attribute_Label: NI

Attribute_Definition: Nickel concentration in parts per million

Attribute:

Attribute_Label: CU

Attribute_Definition: Copper concentration in parts per million

Attribute:

Attribute_Label: ZN

Attribute_Definition: Zinc concentration in parts per million

Attribute:

Attribute_Label: CR

Attribute_Definition: Chromium concentration in parts per million

Attribute:

Attribute_Label: LONGITUDE

Attribute_Definition: Measurement of longitude

Attribute:

Attribute_Label: LATITUDE

Attribute_Definition: Measurement of latitude

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_58_59

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyChemistryMapPointsAnno

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FeatureID

Attribute:

Attribute_Label: ZOrder

Attribute:

Attribute_Label: AnnotationClassID

Attribute:

Attribute_Label: Element

Attribute:

Attribute_Label: SymbolID

Attribute:

Attribute_Label: Status

Attribute:

Attribute_Label: TextString

Attribute:

Attribute_Label: FontName

Attribute:

Attribute_Label: FontSize

Attribute:

Attribute_Label: Bold

Attribute:

Attribute_Label: Italic

Attribute:

Attribute_Label: Underline

Attribute:

Attribute_Label: VerticalAlignment

Attribute:

Attribute_Label: HorizontalAlignment

Attribute:

Attribute_Label: XOffset

Attribute:

Attribute_Label: YOffset

Attribute:

Attribute_Label: Angle

Attribute:

Attribute_Label: FontLeading

Attribute:

Attribute_Label: WordSpacing

Attribute:

Attribute_Label: CharacterWidth

Attribute:

Attribute_Label: CharacterSpacing

Attribute:

Attribute_Label: FlipAngle

Attribute:

Attribute_Label: Override

Attribute:

Attribute_Label: SHAPE_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_58_59

Detailed_Description:

Entity_Type:

Entity_Type_Label: AmboyGeochron

Entity_Type_Definition: Geochronology

Entity_Type_Definition_Source: Author

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: AREA

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Area is always zero for point coverages. Values are automatically generated.

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition: Perimeter of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Perimeter is always zero for point coverages. Values are automatically generated.

Attribute:

Attribute_Label: DATE_

Attribute_Definition: Ar/Ar Date

Attribute_Definition_Source: Author

Attribute:

Attribute_Label: POLYGONID

Attribute:

Attribute_Label: SCALE

Attribute:

Attribute_Label: ANGLE

Attribute_Definition: Degrees from horizontal used for symbol rotation

Attribute_Definition_Source: ESRI

Attribute:

Attribute_Label: pttype

Attribute_Definition: Geochronology Point

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_41_52

Detailed_Description:

Entity_Type:

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Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FeatureID

Attribute:

Attribute_Label: ZOrder

Attribute:

Attribute_Label: AnnotationClassID

Attribute:

Attribute_Label: Element

Attribute:

Attribute_Label: SymbolID

Attribute:

Attribute_Label: Status

Attribute:

Attribute_Label: TextString

Attribute:

Attribute_Label: FontName

Attribute:

Attribute_Label: FontSize

Attribute:

Attribute_Label: Bold

Attribute:

Attribute_Label: Italic

Attribute:

Attribute_Label: Underline

Attribute:

Attribute_Label: VerticalAlignment

Attribute:

Attribute_Label: HorizontalAlignment

Attribute:

Attribute_Label: XOffset

Attribute:

Attribute_Label: YOffset

Attribute:

Attribute_Label: Angle

Attribute:

Attribute_Label: FontLeading

Attribute:

Attribute_Label: WordSpacing

Attribute:

Attribute_Label: CharacterWidth

Attribute:

Attribute_Label: CharacterSpacing

Attribute:

Attribute_Label: FlipAngle

Attribute:

Attribute_Label: Override

Attribute:

Attribute_Label: SHAPE_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Detailed_Description:

Entity_Type:

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Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USGS Information Services

Contact_Address:

Address_Type: mailing address

Address: Box 25286, Denver Federal Center

City: Denver

State_or_Province: CO

Postal_Code: 80225-0046

Country: USA

Contact_Voice_Telephone: (303) 202-4200

Contact_Voice_Telephone: 1-888-ASK-USGS

Contact_Facsimile_Telephone: (303) 202-4695

Contact_Electronic_Mail_Address: infoservices@usgs.gov

Resource_Description:

Downloadable Data USGS Scientific Investigations Map SIM-2885

Distribution_Liability:

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this publication has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.

Standard_Order_Process:

Non-digital_Form:

Paper copies of the map sheets and pamphlet can be obtained by contacting USGS Information Services via the contact information listed above.

Fees:

Plotting fees are set by USGS Information Services, and may be obtained by contacting them via the contact information above.

Metadata_Reference_Information:

Metadata_Date: 20050517

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Karen Wheeler

Contact_Address:

Address_Type: mailing address

Address: 345 Middlefield Rd

Address: MS 973

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025

Country: USA

Contact_Voice_Telephone: (650) 329-4935

Contact_Facsimile_Telephone: (650) 329-4936

Contact_Electronic_Mail_Address: kwheeler@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile