Geologic Map of the Lacamas Creek Quadrangle, Clark County, 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: 05-09-06

Title:

Geologic Map of the Lacamas Creek Quadrangle, Clark County, Washington

Edition: 1.0

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage: <https://pubs.usgs.gov/sim/2006/2924>

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This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits of the Lacamas Creek 7.5-minute quadrangle.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 Lacamas Creek 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 Lacamas Creek 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.

PAMPHLET accompanies map

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 5/9/06

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.501112

East_Bounding_Coordinate: -122.373607

North_Bounding_Coordinate: 45.750615

South_Bounding_Coordinate: 45.624383

Keywords:

Theme:

Theme_Keyword: Ar/Ar geochronology

Theme_Keyword: rock geochemistry

Theme_Keyword: volcanic arc

Place:

Place_Keyword: Pacific Northwest

Place_Keyword: Washington

Place_Keyword: Clark County

Place_Keyword: Cascade Range

Place_Keyword: Portland Basin

Stratum:

Stratum_Keyword: Troutdale Formation

Stratum_Keyword: Tertiary volcanic stratigraphy

Stratum_Keyword: Boring Lava

Stratum_Keyword: Quaternary volcanic rocks

Access_Constraints: None

Use_Constraints:

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 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.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey Pacific Northwest Urban Corridor Mapping Project

Contact_Person: Russ Evarts

Contact_Position: Author

Contact_Address:

Address_Type: mailing and physical address

Address: 345 Middlefield Rd

Address: MS 973

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025

Country: USA

Contact_Voice_Telephone: (650) 329-4929

Contact_Facsimile_Telephone: (650) 329-4936

Contact_Electronic_Mail_Address: revarts@usgs.gov

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Process_Step:

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Map_Projection_Name: Transverse Mercator

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Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -123.000000

Latitude_of_Projection_Origin: 0.000000

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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

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

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

Enumerated_Domain:

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

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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)

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

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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

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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)

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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, r.l., approx. located_m

Enumerated_Domain_Value_Definition:

Trace of approximately located right lateral strike-slip fault positional accuracy generally within 5 mm at 1:24,000 (120 m on the ground) with marker

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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

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

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Attribute_Definition: Geologic Unit Abbreviation

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Enumerated_Domain:

Enumerated_Domain_Value: Qa

Enumerated_Domain_Value_Definition:

Alluvium (Holocene and Pleistocene)-Thin deposits of unconsolidated silt, sand, and gravel along creeks

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. Large slides in eastern part of map area generated by failure of deeply weathered volcaniclastic interbeds within flow-dominated bedrock (Tbem); smaller slides developed in weakly consolidated Neogene sedimentary rocks (Tsr, Ttfc)

Enumerated_Domain:

Enumerated_Domain_Value: Ql

Enumerated_Domain_Value_Definition:

Lake deposits (Holocene and Pleistocene)-Unconsolidated black to gray silt, mud, and organic debris underlying wide flat valley of Lacamas Creek northwest of Lacamas Lake; grade into fine-grained alluvium (Qa) and peat deposits (Qp); overlie gravel probably deposited by cataclysmic floods (Qfg) and hyaloclastic sedimentary rocks (Ttfh); lower part may include Missoula-flood slack-water deposits (Qfs). Sparse well logs indicate deposit is less than 5 m thick

Enumerated_Domain:

Enumerated_Domain_Value: Qp

Enumerated_Domain_Value_Definition:

Peat (Holocene and Pleistocene)-Dark-brown to olive-green fibrous peat and organic-rich mud (Rigg, 1958; Trimble, 1963). Less than 5 m thick; grades southeastward into organic rich lake beds (Ql); overlies gravel probably deposited by cataclysmic floods (Qfg). Distribution is based largely on Clark County soil survey (McGee, 1972)

Enumerated_Domain:

Enumerated_Domain_Value:

Cataclysmic-flood deposits (Qfg and Qfs) Individual Units Descriptions Follow

Enumerated_Domain_Value_Definition:

(Pleistocene)-Sediment deposited by colossal glacier-outburst floods caused by repeated failures of ice dam at Pleistocene Lake Missoula in Montana, (Bretz, 1925, 1959; Bretz and others, 1956; Trimble, 1963; Allison, 1978; Baker and Bunker, 1985; Waitt, 1985, 1994, 1996; Atwater, 1986; O'Connor and Baker, 1992; Benito and O'Connor, 2003). Floods exiting Columbia River Gorge spread out in Portland Basin and deposited coarse load in series of large bars and plains, the Portland delta of Bretz (1925). Hydraulically dammed floodwaters temporarily ponded in Portland Basin and deposited suspended sediment load (Trimble, 1963). Radiocarbon and tephrochronologic data from outside the map area indicate depositional ages between about 17,000 and 13,000 14C years B.P. (Waitt, 1985, 1994; Atwater, 1986; Benito and O'Connor, 2003; Clague and others, 2003). Coarse bedload deposits and fine slack-water deposits mapped separately

Enumerated_Domain:

Enumerated_Domain_Value: Qfs

Enumerated_Domain_Value_Definition:

Sand and silt facies-Unconsolidated deposits of silt, sand, and minor clay mantling surfaces below about 300 ft (90 m) elevation in northwest part of quadrangle. Rarely exposed; distribution inferred largely from well logs, which indicate thickness of unit in map area ranges from 0 to about 15 m. Composed largely of quartz, feldspar, and muscovite, indicating deposition by Columbia River rather than by local streams. Consists of sediment deposited by rapidly decelerating and temporarily ponded floodwaters

Enumerated_Domain:

Enumerated_Domain_Value: Qfg

Enumerated_Domain_Value_Definition:

Gravel facies-Unconsolidated bouldery pebble to cobble gravel in southwestern part of map area. Underlies Lacamas Creek valley northwest of Lacamas Lake and Mill Plain, part of a large bar formed in the lee of Prune Hill to the south (Waitt, 1994). Equivalent to the gravelly phase of lacustrine deposits of Trimble (1963). Poorly sorted; clast-supported; contains well-rounded to subangular clasts as large as 2.5 m diameter; some open-work gravel, but most contains matrix of basaltic to arkosic sand. Excavations reveal foreset bedding with west to northwest dips as great as 25°. Clast population dominated by Columbia River Basalt Group and Pliocene or younger basalts from the Cascade Range; commonly includes Tertiary volcanic rocks, pre-Tertiary granitic and metamorphic rocks, and quartzite. Well logs indicate that gravel grades into mixed sand and gravel north of Fifth Plain Creek

Enumerated_Domain:

Enumerated_Domain_Value: Qbgm

Enumerated_Domain_Value_Definition:

asaltic andesite of Green Mountain (Pleistocene)Olivine phyric basaltic andesite erupted from cinder cone at west end of Green Mountain. Light-gray, microvesicular, generally platy lava flow, extending about 1 km to northwest of Green Mountain, consists of olivine phenocrysts (2-4 percent; 0.5 to 3 mm across; contains inclusions of chromian spinel; rims variably replaced by iddingsite) in a fine-grained trachytic groundmass of plagioclase, clinopyroxene, orthopyroxene, and Fe-Ti oxide; locally contains quartzite pebbles and small, dark, fine-grained clots that may be sedimentary xenoliths, both presumably derived from underlying gravels (units QTc and Ttfc). Conical hill at west end of Green Mountain consists largely of deeply weathered basaltic ash; platy basaltic andesite lava crops out at summit and presumably fills vent. Lava flow has normal magnetic polarity (J.T. Hagstrum, written commun., 1999) and yielded an 40Ar/39Ar age of 575±7 ka (table 2)

Enumerated_Domain:

Enumerated_Domain_Value: Qbmc

Enumerated_Domain_Value_Definition:

Basalt of Matney Creek (Pleistocene)-Olivine-phyric and augite-microphyric basalt erupted from breached cinder cone south of Matney Creek. Light to dark gray, microvesicular to scoriaceous lava flow consists of olivine phenocrysts (about 5 percent; 0.5 to 2 mm across; with inclusions of chromian spinel; variably replaced by iddingsite), greenish augite microphenocrysts (2-3 percent; 0.2 to 0.5 mm long; commonly in multigrain clots), and rare plagioclase phenocrysts in a dark, trachytic, cryptocrystalline groundmass with traces of vapor-phase phlogopite. Cinder cone about 1.5 km to the northeast of Brunner Hill consists of weathered, dark grayish- to reddish-brown scoria. Overlies unnamed conglomerate (QTc). Chemically and petrographically similar to basaltic andesite of Brunner Hill, and presumed to be of similar age

Enumerated_Domain:

Enumerated_Domain_Value: Qbbh

Enumerated_Domain_Value_Definition:

Basaltic andesite of Brunner Hill (Pleistocene)-Olivine-phyric and augite-microphyric basaltic andesite erupted from cinder cone at Brunner Hill. Light- to dark-gray, microvesicular to scoriaceous flow consists of olivine phenocrysts (4-5 percent; 0.5 to 2 mm across; with inclusions of chromian spinel; variably replaced by iddingsite), greenish augite microphenocrysts (1-3 percent; 0.2 to 0.5 mm long; commonly in multigrain clots), and rare plagioclase microphenocrysts in a trachytic to intergranular groundmass of plagioclase, clinopyroxene, olivine, Fe-Ti oxide, and minor interstitial glass; locally contains xenocrysts of plagioclase and quartz and round quartzite pebbles derived from underlying conglomerates in units QTc and Ttfc. Cinder cone is made up of weathered, dark grayish- to reddish-brown scoria Sample of lava flow collected to southwest of Brunner Hill has 40Ar/39Ar age of 627±9 ka (table 2)

Enumerated_Domain:

Enumerated_Domain_Value: QTc

Enumerated_Domain_Value_Definition:

Conglomerate (Pleistocene and (or) Pliocene)-Unconsolidated to semiconsolidated, thick-bedded, pebble to boulder conglomerate with matrix of volcanic lithic to micaceous, quartzofeldspathic sand. Highly weathered and poorly exposed in map area; thickness uncertain but probably no more than 50 m. Clast population dominated by volcanic rocks eroded from western Cascade Range and Columbia River Basalt Group, includes minor quartzite. Poorly sorted to moderately well sorted and clast-supported, with clasts as large as 20 cm; most clasts well rounded but some porphyritic clasts subangular. Equivalent to alluvial-fan member of Troutdale Formation of Howard (2002). Age uncertain; unit overlain and (or) intruded by approximately 650,000-year-old basaltic andesite (Qbgm); probably late Pliocene to early Pleistocene

Enumerated_Domain:

Enumerated_Domain_Value:

Troutdale Formation (Ttfh & Ttfc) Individual Units Descriptions Follow

Enumerated_Domain_Value_Definition:

(Pliocene and Miocene?)Semi-consolidated to well consolidated conglomerate and sandstone. Divided into two informal members separated by an unconformity

Enumerated_Domain:

Enumerated_Domain_Value: Ttfh

Enumerated_Domain_Value_Definition:

Hyaoclastic sandstone member (Pleistocene or Pliocene)Indurated, coarse-grained sandstone and granule conglomerate composed largely of glassy to lithic basaltic debris; commonly contains dispersed pebbles and cobbles; cobble conglomeratic beds locally abundant. Crops out on northern shores of Lacamas Lake and in bed of Lacamas Creek west of Lacamas Campground. Equivalent to rocks called vitric sandstone by Trimble (1963) and Tolan and Beeson (1984) and correlative with strata in the type area of the Troutdale Formation along the Sandy River in Oregon (Hodge, 1938). Thickness in map area unknown but increases to southwest and may exceed 50 m. Typical sandy beds are massive, moderately well sorted, crudely stratified, and commonly crossbedded; consist of angular to subrounded fragments 2 to 6 mm across of black, generally nonvesicular basalt containing crystals of olivine (as much as 2 mm across) and plagioclase (as much as 3 mm long) in a vitric to tachylitic to intergranular groundmass. Vitric clasts contain abundant pale brown sideromelane that is variably altered to palagonite, which imparts a distinctive yellowish-brown color to the originally dark green rock; clasts cemented by smectitic clay produced during palagonitization. Many beds contain minor amounts of admixed nonvolcanic debris such as quartz, muscovite, hornblende, and quartzite grains. Well rounded to subrounded pebbles and cobbles include varying proportions of olivine-phyric basalt, basaltic rocks of the Columbia River Basalt Group, quartzite, and other rock types. Angular nonvesicular vitric clasts probably formed by rapid chilling and quench fragmentation during interaction of basaltic lava with water; cross-stratification, interbedding with conglomerate, and mixing with nonvolcanic debris indicate deposition in fluvial environment, but textural immaturity and monolithologic character of many beds suggest transport was limited. Interpreted as hyaloclastic debris that was generated by basaltic eruptions in the Columbia River Gorge, and rapidly transported downstream and redeposited in eastern Portland Basin (Trimble, 1963; Tolan and Beeson, 1984; Swanson, 1986). Equivalent to informal upper member of Troutdale Formation mapped by Tolan and Beeson (1984) in Columbia River Gorge. Overlain by unnamed conglomerate (QTc)

Enumerated_Domain:

Enumerated_Domain_Value: Ttfc

Enumerated_Domain_Value_Definition:

Conglomerate member (Pliocene and (or) Miocene)Massive to crudely stratified, pebbly and cobbly conglomerate with sparse to abundant lenses of friable to lithified, arkosic to basaltic sandstone; poorly sorted to well sorted and clast-supported, with openwork fabric or sandstone matrix. Underlies broad, dissected surface that slopes south to southwest from about 550 ft to 450 ft (170 m to 135 m) elevation north of Shanghai Creek; also underlies Camp Hill, Munsell Hill, east part of Green Mountain ridge, and area east of Brunner Hill. Generally less than 75 m thick. Cobbles of basalt from the Columbia River Basalt Group dominate, but light-colored granitic and quartzofeldspathic metamorphic rocks and distinctive, white to light-gray, iron-oxide stained quartzite clasts are generally abundant; clasts of volcanic rocks eroded from Cascade Range are uncommon. Sandstone interbeds and matrix of conglomerate range from basaltic grit to micaceous arkose. These rock types indicate dominant source areas east of the Cascade Range and deposition by the ancestral Columbia River. Sedimentary structures suggest deposition in a gravel-bed braided river system; clast imbrication in exposure near Hockinson indicates northward transport direction. In most places, upper several meters weathered to reddish-brown clayey soil; in such areas, presence of scattered quartzite pebbles in soil is only indicator of conglomeratic parent material. Equivalent in part to upper member of Troutdale Formation of Mundorff (1964); correlative with lower member of Troutdale Formation of Tolan and Beeson (1984) and with quartzite-clast member of Troutdale Formation of Howard (2002) (see fig. 4). Age inferred from stratigraphic relations outside of quadrangle (Tolan and Beeson, 1984)

Enumerated_Domain:

Enumerated_Domain_Value: Tsr

Enumerated_Domain_Value_Definition:

Sandy River Mudstone (Miocene)Semiconsolidated, well-bedded sandstone, siltstone, claystone, and minor quartzite-bearing pebble conglomerate, pumice-lapilli tuff, and lignite. Rarely exposed in map area; distribution inferred chiefly from water-well logs, which indicate unit is as much as 300 m thick near Green Mountain. Where exposed outside of map area, consists largely of fluvial sediment, the composition of which indicates an eastern Washington or Idaho provenance and deposition by the ancestral Columbia River. Unconformably rests on Paleogene bedrock; disconformably overlain by Troutdale Formation (Ttfc and Ttfh). Equivalent to lower member of Troutdale Formation of Mundorff (1964) and fine-grained member of Troutdale Formation of Howard (2002). Age poorly constrained. Plant fossils from near top of unit at localities outside of quadrangle assigned late Miocene or Pliocene ages (Trimble, 1963; Mundorff, 1964; Tolan and Beeson, 1984)

Enumerated_Domain:

Enumerated_Domain_Value: Tbem

Enumerated_Domain_Value_Definition:

Basaltic andesite of Elkhorn Mountain (Oligocene)Sequence of tholeiitic basaltic andesite and basalt flows and flow breccia. Constitutes all Tertiary bedrock in map area and underlies large areas to north, east, and south (Evarts, 2006; R.C. Evarts, unpub. data). Flows are dark-gray to brown, porphyritic to seriate to aphyric, locally columnar-jointed, commonly weather into spheroidal blocks 1 to 3 m across. About 250 m thick in northeast part of map area; unit locally contains sedimentary interbeds too thin or too poorly exposed to map. Individual flows typically about 5 to 8 m thick, range up to 50 m thick. Typical porphyritic flows contain phenocrysts and glomerocrysts of weakly zoned plagioclase (as much as 55 percent; 1 to 6 mm, rarely more than 10 mm long; variably replaced by zeolites and (or) clay) and olivine (less than 2 percent; 0.5 to 3 mm across; commonly partly resorbed and surrounded by rinds of granular pyroxene and (or) magnetite; rarely contain minute chromian spinel inclusions; almost invariably replaced by some combination of smectite, hematite, carbonate, serpentine, quartz and kaolinite). Some flows also contain phenocrysts of augite (less than 1 percent; 0.5 to 1 mm across) and microphenocrysts of Fe-Ti oxide. Groundmass consists of plagioclase, augite, Fe-Ti oxide, and minor to abundant interstitial glass (largely devitrified or replaced by smectite, quartz, or calcite); groundmass textures chiefly intergranular to trachytic, less commonly subophitic or microphyric. All flows in unit are tholeiitic, and many are exceptionally rich in Fe (FeO* as high as 12.8 wt. percent) and poor in Sr (mostly less than 320 ppm) compared to mafic rocks elsewhere in southern Washington Cascade range (Evarts, 2001, 2002, 2004a, b, 2005, 2006; R.C. Evarts, unpub. data). Knob about 2 km northwest of Little Elkhorn is underlain by brick-red, zeolitized agglomerate composed of scoriaceous, plagioclase-phyric, basaltic andesite lapilli; may be remains of parasitic cinder cone

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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: LTYPE

Attribute_Definition: Cross Section Lines

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.

Attribute:

Attribute_Label: SectionLine

Attribute_Definition: Cross Section Label

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: A

Enumerated_Domain_Value_Definition: Cross Section Line A-A'

Enumerated_Domain:

Enumerated_Domain_Value: B

Enumerated_Domain_Value_Definition: Cross Section Line B-B'

Detailed_Description:

Entity_Type:

Entity_Type_Label: LacamasCrkStrucPts

Entity_Type_Definition: Geologic Bedding Measurements

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: PTTYPE

Attribute_Definition: Geologic Bedding Description

Attribute_Definition_Source: Author

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: platy parting

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

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_15_16

Detailed_Description:

Entity_Type:

Entity_Type_Label: LacamasCrkStrucPtsAnno

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_15_16

Detailed_Description:

Entity_Type:

Entity_Type_Label: LacamasCrkChemPts

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:

Attribute_Label: Plot

Attribute_Definition: Designation if point will be plotted

Attribute:

Attribute_Label: LATITUDE__

Attribute_Definition: Measurement of latitude

Attribute:

Attribute_Label: LONGITUDE_

Attribute_Definition: Measurement of longitude

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: BIOTITE

Attribute_Definition: Modal percent biotite 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

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

Detailed_Description:

Entity_Type:

Entity_Type_Label: Anno_25_26

Detailed_Description:

Entity_Type:

Entity_Type_Label: LacamasCrkChemPtsAnno

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_25_26

Detailed_Description:

Entity_Type:

Entity_Type_Label: LacamasCrkGeochronPts

Entity_Type_Definition: Geochronologic Sample Locations

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: PTTYPE

Attribute_Definition: Geochronology Point

Attribute_Definition_Source: Author

Attribute:

Attribute_Label: AGE

Attribute_Definition: Ar/Ar Date in ka

Attribute_Definition_Source: Author

Detailed_Description:

Entity_Type:

Entity_Type_Label: LacamasCrkGeologicUnit

Entity_Type_Definition: Map 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: Unit

Attribute_Definition: Unit Abbreviation on Map

Attribute:

Attribute_Label: Age

Attribute_Definition: Geologic Age

Attribute:

Attribute_Label: Unit_Name

Attribute_Definition: Name of formation or unit

Attribute:

Attribute_Label: Unit_Type1

Attribute_Definition: First Order Unit Heading

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Surficial Deposits

Enumerated_Domain:

Enumerated_Domain_Value: Basin-Fill Deposits

Enumerated_Domain:

Enumerated_Domain_Value: Bedrock

Attribute:

Attribute_Label: Unit_Type2

Attribute_Definition: Second Order Unit Heading

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Alluvial and mass wastage deposits

Enumerated_Domain:

Enumerated_Domain_Value: Volcanic Rocks

Enumerated_Domain:

Enumerated_Domain_Value: Sedimentary Rocks

Enumerated_Domain:

Enumerated_Domain_Value: Volcanic and sedimentary rocks

Attribute:

Attribute_Label: Unit_Type3

Attribute_Definition: Third Order Unit Heading

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Cataclysmic-flood deposits

Enumerated_Domain_Value_Definition:

Sediment deposited by colossal glacier-outburst floods caused by repeated failures of ice dam at Pleistocene Lake Missoula in Montana, (Bretz, 1925, 1959; Bretz and others, 1956; Trimble, 1963; Allison, 1978; Baker and Bunker, 1985; Waitt, 1985, 1994, 1996; Atwater, 1986; O'Connor and Baker, 1992; Benito and O'Connor, 2003). Floods exiting Columbia River Gorge spread out in Portland Basin and deposited coarse load in series of large bars and plains, the Portland delta of Bretz (1925). Hydraulically dammed floodwaters temporarily ponded in Portland Basin and deposited suspended sediment load (Trimble, 1963). Radiocarbon and tephrochronologic data from outside the map area indicate depositional ages between about 17,000 and 13,000 14C years B.P. (Waitt, 1985, 1994; Atwater, 1986; Benito and O'Connor, 2003; Clague and others, 2003). Coarse bedload deposits and fine slack-water deposits mapped separately

Enumerated_Domain:

Enumerated_Domain_Value: Troutdale Formation

Enumerated_Domain_Value_Definition:

Semi-consolidated to well consolidated conglomerate and sandstone. Divided into two informal members separated by an unconformity

Attribute:

Attribute_Label: Unit_Description

Attribute_Definition: Map Unit Description

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

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:

Digital_Form:

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://geopubs.wr.usgs.gov/sim/2006/2924/>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20060516

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Karen Wheeler

Contact_Organization:

U.S. Geological Survey Pacific Northwest Urban Corridor Mapping Project

Contact_Address:

Address_Type: mailing and physical 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