Identification_Information: Citation: Citation_Information: Originator: Ray Wells (geologic mapping) Originator: M. Sawlan (digital database) Publication_Date: 20140716 Title: EWH_geology_polys Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: OFR 2014–1063 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2014/1063 Online_Linkage: http://dx.doi.gov/10.3133/ofr20141063 Larger_Work_Citation: Citation_Information: Originator: Wells, Ray E. Publication_Date: 20140716 Title: Preliminary Geologic Map of the Eastern Willapa Hills, Cowlitz, Lewis, and Wahkiakum Counties, Washington Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Open–File Report Issue_Identification: OFR 2014–1063 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2014/1063 Online_Linkage: http://dx.doi.gov/10.3133/ofr20141063 Description: Abstract: This ditigal feature set comprises polygons delineating areas underlain by the mapped geologic units. Units correspond to those defined in the map originally published in analog (paper) form as: Wells, Ray E., 1981, Geologic Map of the Eastern Willapa Hills - Cowlitz, Lewis, and Wahkiakum Counties, Washington, U.S. Geological Survey Open File Report 81-674. The description of map units is provided in the Supplementary Information of the metadata for this feature class and also as a table (EWH_dmu) within the geodatabase. Minor differences between the digital database polygons and polygons shown on the 1981 analog map include the following: -The name of the unit mapped as Goble Volcanics in the original 1981 publication has been changed to Grays River Volcanics to be consistent with currently accepted geologic nomenclature (see feature class EWH_dmu). The unit symbol, Tgv, remains the same as in the original 1981 analog map. - Minor modifications were made to polygon boundaries next to shorelines in the vicinity of the Columbia River and larger tributaries. These changes accomodate minor differences in locations of water body boundaries between the USGS 15-minute series topographic base map used as a base in the original 1981 analog map, and the more recent and more detailed USGS 7.5-minute series topographic base maps used for this digital map database. - The Description of Map Units in this digital database (see feature class table EWH_dmu and Supplemental Information field in metadata for this EWH_geology_polygons feature class) includes one additional unit: Tm - Undifferentiated McIntosh Formation and Sandstone (Eocene). This unit is not represented in map view; it refers to a unit shown at depth only in cross section. The geologic units represented by the polygons are Text of the description of map units, with unit symbols, is provided in Supplemental Information metadata field for this feature class. In constructing the map database, these polygons are derivative from the line feature class containing (unconcealed) contacts (feature class: EWH_contacts_surficial), and therefore are identical to these lines in the location and number of vertices defining unconcealed contacts. The polygons are not divided by concealed contacts. Attributes. Polygons have a single assigned attribute of Utype (Unit type), a text field containing geologic unit symbols identifying the mapped rock unit. This field is used to label the polygons. Values for Utype include unit symbols for all geologic units mapped on the surface (listed in table EWH_dmu), but do not include Undifferentiated McIntosh Formation and Sandstone (Tm) which is shown only at depth in cross section. In addition to geologic map units, Utype values also include "unmapped" to identify areas within Oregon which were not mapped in this study, and "water" to identify polygons delineating the extent of water bodies. Unit symbols listed under Utype appended with a query indicate uncertain identification of the geologic unit within the area of the polygon. Purpose: This dataset defines the spatial distribution of geologic units at the surface. The polygons enable generation of a map in which geologic units are differentiated by color. Supplemental_Information: The description of map units is provided below and in the table "EWH_dmu" within the geodatabase, Eastern_Willapa_Hills_geodatabase.mdb. DESCRIPTION OF MAP UNITS Qa - Alluvial deposits (Holocene)-Silt, sand, and gravel along Rivers and streams; some low lying river terrace deposits, thick colluvium, and tidal flat mud and beach sand along the Columbia River Qls -Landslide debris (Holocene and Pleistocene)-Landslides very abundant in all rock units; only the largest are shown on the map Qlh - Logan Hill Formation (Snavely and others, 1958E), (Pleistocene)-Partly weathered gravel and sand Tsmp - Saddle Mountains Basalt of the Columbia River Basalt Group; Pomona Member (middle Miocene)-One basalt flow, up to 100 meters thick west of Mill Creek; exhibits characteristic wavy, irregular columnar jointing and contains up to 20 per cent stubby plagioclase phenocrysts, some with clinopyroxene inclusions; magnetic polarity is reversed (Simpson and others, 1980); Chemistry is equivalent to that of the Pomona flow (Swanson and others 1979); basalt is overlain by deeply weathered basalt conglomerate containing ferruginous bauxite deposits (Livingston, 1966) Tnm - Non-marine sedimentary rocks of Snavely and others (1958); (middle Miocene)-Poorly consolidated siltstone, sandstone, and conglomerate; contains fossil plants Tau - Astoria(?) Formation, Upper Member (middle Miocene)-Thick to thin bedded; friable, very fine to medium grained, micaceous, arkosic sandstone and silty sandstone; plane laminated thin bedded micaceous siltstone, some with large, low-angle cross bedding sets; large channels in siltstone filled with very coarse sand and transported blocks of siltstone; convolute bedding and slump structures common; fossils not yet found in this unit Timb - Basalt intrusive rocks (middle Miocene)-dikes and sills of dark gray, aphanitic, aphyric to sparsely plagioclase-phyric basalt intruding Lincoln Creek and Cowlitz Formations; could be invasive Grande Ronde Basalt or Wanapum Basalt related to the nearby flows (see Beeson and others, 1979, and Snavely and others, 1973) Twfs - Wanapum Basalt of the Columbia River Basalt Group; Frenchman Springs Member (middle Miocene)-At least two flows of fine grained basalt and associated flow breccia with total thickness of 100 meters, flows have well developed colonnades, with straight-sided columns up to 2 m in diameter; flows very sparsely plagioclase-phyric with phenocrysts up to 1.5 cm long; magnetic polarity is normal and chemistry is equivalent to Frenchman Springs flows of the Columbia Plateau (Swanson and others, 1979) Tgr - Grande Ronde Basalt of the Columbia River Basalt Group (middle Miocene)-One or more flows of dark gray aphanitic, aphyric basalt with well developed entablature; overlain by three or four flows of light gray, sugary, fine grained aphyric basalt with well developed colonnades; flows locally pillowed at base; hyaloclastite abundant west of Skamokawa; magnetic polarity is normal, and chemistry of the upper three flows is similar to High-Mg Grande Ronde Basalt of the plateau (Swanson and others, 1979); chemistry of lower flows is similar to Low-Mg Grande Ronde Basalt; flows are separated by basaltic conglomerate, basaltic to arkosic fine to very coarse sandstone and siltstone; Grande Ronde Basalt separated from overlying Frenchman Springs Basalt by discontinuous arkosic sandstone containing carbonized logs; maximum thickness of Grande Ronde Basalt is 75 meters Tal - Astoria(?) Formation, Lower Member (early and middle Miocene)-Thick to thin bedded, very fine to medium grained, plane laminated, carbonaceous, micaceous friable sandstone; basalt and quartzite conglomerate lenses locally common, bioturbation and slump structures in places; Molluscan fauna referred to Newportian or Pillarian Stages of Addicott (1976) Tlc - Lincoln Creek Formation (upper Eocene and Oligocene)- Tuffaceous siltstone and very fine sandstone; massive to thick bedded, concretionary, bioturbated, with interbeds of glauconitic sandstone and tuff; thin bedded, laminated siltstone in southwesternmost exposures; Molluscan fauna referred to Blakely Stage of Weaver (1944); Foraminifera referred to Refugian and Zemorrian Stages of Kleinpell (1938)2 Tlcs - Sandstone at base of Lincoln Creek Formation (upper Eocene)-Massive to thick bedded, moderately well sorted and indurated, fossiliferous, dark gray, fine grained arkosic to basaltic sandstone; Molluscan fauna referred to Galvinian Stage of Armentrout (1975) and Lincoln Stage of Weaver (1944) Tsc - Siltstone of Skamokawa Creek (upper Eocene)-Thin bedded, laminated burrowed, concretionary, tuffaceous siltstone; contains thin tuff beds in places; abundant Foraminifera are referred to the upper part of the Narizian stage of Mallory (1959) Tiqm - Quartz monzonite stock (late Eocene to Oligocene?)-light gray to tan, quartz monzonite to granodiorite with blocky jointing, contains inclusions of Grays River Volcanics; hypidiomorphic granular, granophyric and porphyritic texture; see Livingston (1966) for chemical analysis Tgv - Grays River Volcanics (upper Eocene)-subaerial basalt flows and interbedded siltstone and sandstone; flows show columnar and platy jointing, weathered flow tops, and oxidized red basal flow breccias over baked and altered sedimentary interbeds; basalts are aphyric to densely porphyritic, contain phenocrysts of plagioclase, clinopyroxene, and olivine; Foraminifera from siltstones beneath the basalt and immediately overlying it are referred to the upper Narizian Stage of Mallory (1959); called Goble Volcanics in original publication Tib - Basalt intrusive rocks (Eocene)-dikes and sills of medium to fine grained aphyric to extremely porphyritic basalt; many related to Grays River Volcanics, but some may be older Tc - Cowlitz Formation (Weaver, 1937) (upper middle and upper Eocene)-massive to thin bedded, plane laminated and cross bedded, friable, very fine to coarse-grained, micaceous, arkosic sandstone; interbedded laminated micaceous, carbonaceous siltstone, tuffaceous siltstone, and very coarse-grained basaltic, andesitic, and tuffaceous sandstone; thin sub-bituminous coal up to 30 cm thick north of Abernathy Mountain; see Livingston (1966) for additional coal localities; Foraminifera are referred to the upper Narizian Stage of Mallory (1959) Tcv - Basalt breccia and flows-basalt breccia, massive flows and intrusive rock interbedded in the Cowlitz Formation along Columbia River Tm - Undifferentiated McIntosh Formation and Sandstone (Eocene)-Includes upper and lower members of the McIntosh Formation and Sandstone (Tmus); shown only in cross section at depth Tmu - McIntosh Formation, Upper Member (middle and upper Eocene)-dark gray massive to laminated, thin bedded, tuffaceous siltstone, silty sandstone and arkosic sandstones; basalt cobble conglomerate and slump breccias occur locally; upper part of unit equivalent in age to Cowlitz Formation in west half of map area, Rau (1958); Foraminifera are referred to the Narizian Stage of Mallory (1959); equivalent to the upper part of Henriksens (1956) Stillwater Creek Member of the Cowlitz Formation Tmus - Sandstone (middle Eocene)-massive to thick bedded, plane laminated to cross bedded, friable, fine to medium grained, arkosic sandstone interbedded at the base of the upper member of the McIntosh Formation Tig - Gabbro and basalt intrusive rocks (early or middle Eocene)- massive to blocky jointed and columnar jointed, fine to very coarse grained gabbro sill complex; marginal facies are basalt and have well developed columnar jointing, while interiors are very coarse-grained to pegmatitic; gabbro and basalt are vesicular and typically flow banded, a result of planar concentrations of vesicles and /or crystal sorting; interstitial glass is generally altered to green clays and vesicles are filled with clay, calcite, or zeolite; gabbros intrude the upper Crescent Formation and along the contact between Crescent Formation and Lower Member of the McIntosh Formation; some gabbro and basalt intruding Crescent Formation may be part of Crescent Formation volcanism; some may be younger and related to Grays River Volcanics Tml - McIntosh Formation, Lower Member (lower and middle Eocene)-massive to thin bedded and laminated very fine grained to coarse grained basaltic sandstone, arkosic sandstone and laminated tuffaceous siltstone, sandstone commonly shows graded bedding; sandstones are less common on east flank of the Willapa Hills; interbedded in lower part of are pillow basalt flows of the Crescent Formation; Foraminifera are referred to the upper Ulatisian and lower Narizian Stages of Mallory (1959); equivalent to the lower part of Henriksen's (1956) Stillwater Creek Member of the Cowlitz Formation Tcbs - Basalt breccia and sandstone-massive to well bedded basalt lapilli tuff, tuff breccia, basaltic sandstone, siltstone and conglomerate; lapilli tuff consists of palagonitic vesicular basaltic glass and altered glass shards commonly cemented by calcite and zeolite; graded bedding is common; forms thick sequences interbedded with Lower Member of the McIntosh Formation and upper part of Crescent Formation Tcbs - Crescent Formation (lower and lower middle Eocene)-pillow flows, massive and columnar jointed flow interiors, pillow breccia, lapilli tuff breccia, and filled lava tubes of tholeiitic and alkalic basalt, basalt groundmass altered to green and brown clays; zeolite and calcite fracture fillings are ubiquitous; contains minor amounts of mudflow breccia, basaltic sandstone, and interbedded laminated siltstone; includes a few dikes and sills not differentiated on the map; this assemblage is interpreted as a seamount built on oceanic crust, similar to the Siletz River Volcanics of Snavely and others (1968); Foraminifera from interbedded siltstones are referred to the upper Penutian or Ulatisian Stages of Mallory (1959) Tcs - Siltstone-thin bedded laminated tuffaceous siltstone interbedded with pillow basalt of the Crescent Formation Tcsb - Subaerial basalt-massive to very vesicular, platy, plagioclase phyric basalt flows and flow breccias with weathered tops and baked and oxidized bottom contacts; interbedded with basalt boulder conglomerate; basalt groundmass is in part altered to clays, and vesicles are filled with calcite and zeolite [References for chemical analysis and fossil calls; numbers refer to superscripts in the Description of Map Units] 1 Chemical analysis of the Columbia River Basalt samples by P. R. Hooper 2 Identification of Foraminifera by Weldon W. Rau 3 Identification of Molluscan fauna by Ellen James Moore Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2014 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.504535 East_Bounding_Coordinate: -123.000000 North_Bounding_Coordinate: 46.638037 South_Bounding_Coordinate: 46.141407 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: geologic map Theme_Keyword: geologic units Place: Place_Keyword: Eastern Willapa Hills Place_Keyword: Southwestern Washington Place_Keyword: Lower Columbia River Place_Keyword: Cowlitz County, WA Place_Keyword: Lewis County, WA Place_Keyword: Wahkiakum County Place_Keyword: Adna Place_Keyword: Blaney Creek Place_Keyword: Boistfort Peak Place_Keyword: Boistfort Place_Keyword: Cathlamet Place_Keyword: Coal Creek Place_Keyword: Curtis Place_Keyword: Dean Creek Place_Keyword: Doty Place_Keyword: Elochman Pass Place_Keyword: Elochoman Lake Place_Keyword: Nassa Point Place_Keyword: Oak Point Place_Keyword: Pe Ell Place_Keyword: Pluvius Place_Keyword: Rainbow Falls Place_Keyword: Skamokawa Pass Place_Keyword: Skamokawa Place_Keyword: Wildwood Stratum: Stratum_Keyword: Alluvial deposits Stratum_Keyword: Alluvium Stratum_Keyword: Landslide Stratum_Keyword: Logan Hill Formation Stratum_Keyword: Columbia River Basalt Stratum_Keyword: CRB Stratum_Keyword: Saddle Mountains Basalt Stratum_Keyword: Pomona Stratum_Keyword: Wanapum Basalt Stratum_Keyword: Frenchman Springs Stratum_Keyword: Grande Ronde Basalt Stratum_Keyword: Astoria Formation Stratum_Keyword: Basalt intrusive rocks Stratum_Keyword: Basalt breccia and flows Stratum_Keyword: Lincoln Creek Formation Stratum_Keyword: Siltstone of Skamokawa Creek Stratum_Keyword: Quartz monzonite Stratum_Keyword: Grays River Volcanics Stratum_Keyword: Cowlitz Formation Stratum_Keyword: McIntosh Formation Stratum_Keyword: Crescent Formation Stratum_Keyword: Crescent Basalt Temporal: Temporal_Keyword: Tertiary Temporal_Keyword: Quaternary Temporal_Keyword: Eocene Temporal_Keyword: Oligocene Temporal_Keyword: Miocene Temporal_Keyword: Pleistocene Temporal_Keyword: Holocene Access_Constraints: None Access_Constraints: None Use_Constraints: Users of this geospatial database and geologic information derived from it should acknowledge the U.S. Geological Survey as the source of the data. 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 3; ESRI ArcCatalog 9.2.0.1324 Data_Quality_Information: Lineage: Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: EWH_geology_polys_metadata.txt Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 1040 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 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: 0.000064 Ordinate_Resolution: 0.000064 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Resolution: 0.000003 Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: EWH_geology_polys Entity_Type_Definition: polygons defining the extent of geologic units mapped at the surface 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: Utype Attribute_Definition: unit symbol of geologic map unit (see above Supplemental_Information, Description of Map Units) Attribute_Definition_Source: author 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_88_95 Entity_Type_Definition: link between map unit symbols in Utype field of EWH_geology_polys and annotation layer displaying map unit symbols Entity_Type_Definition_Source: author Resource_Description: Downloadable Data USGS Open File Report 2014-1063 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://pubs.usgs.gov/of/2014/1063 Fees: free Metadata_Reference_Information: Metadata_Date: 20140507 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Ray Wells Contact_Organization: U.S. Geological Survey Contact_Position: Geologist / Project Chief, Pacific Northwest Geologic Mapping Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Address: 345 Middlefield Rd MS-973 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Contact_Voice_Telephone: 650-329-4933 Contact_Electronic_Mail_Address: rwells@usgs.gov Contact_Instructions: Additional contact: Karen Wheeler, PNW Project Data Manager, 650-329-4935, 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