Identification_Information: Citation: Citation_Information: Originator: Bednarski, J.M. Publication_Date: 2009 Title: Clearwater Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open File Issue_Identification: 6133 Publication_Information: Publication_Place: Ottawa, Ontario Publisher: Geological Survey of Canada, Natural Resources Canada Other_Citation_Details: Recommended citation: Bednarski, J.M. 2009: Surficial geology, Clearwater, British Columbia; Geological Survey of Canada, Open File 6133, scale 1:50 000. Online_Linkage: Description: Abstract: The Clearwater map area consists of gently rolling to rugged uplands at about 1200 m in elevation, with summits reaching over 1900 m in three separate areas. The uplands are dissected into three roughly triangular sectors by the North Thompson and Clearwater Rivers in the east and a broad valley running from the northwest corner of the map area to the southeast. A maximum of about 1500 m of topographic relief occurs between the floor of the North Thompson valley and the rugged mountains to the east, part the Shushwap Highlands. The bedrock is very diverse with Mesozoic granitic rock intruding into sedimentary and volcanic formations of Paleozoic age. Moreover, flat lying or gently dipping Tertiary lavas usually obscure the older rocks. Most of the ridges in the area are rounded and appear to be glacially overtopped in the past. Long glacial flutings are usually discernible on rock surfaces and areas of discontinuous till cover on local uplands. Till cover is usually thicker down valley slopes where it forms continuous blankets. Several ice-flow directions are prominent in the area. In the northern sector, between the North Thompson River and Mann Creek valley, the dominant flow was from the north likely completely inundating Grizzly Mountain and Clearwater Peak (>1900 m above sea level). In the southwest sector of the map area, the dominant flow was to the southeast. This is approximately along the axis of the Mann Creek valley and a broad valley running parallel to it, now partially occupied by Taweel Lake. A third major flow direction from the northeast, is found east of North Thompson River. Ice flows contrary to the main flow directions are found in small areas within the main flow zones. These flows may be remnants of older ice advances or they may be short-lived deglacial flows of thinner ice tongues where the local topography exerted a greater influence on the glaciers. Unfortunately, because the contrary flows are found in isolation, it was not possible to determine their relative age. Deglaciation in the northwest part of the map area likely progressed to the north and to the northwest in the western part of the map area. However, in the eastern half of the map area, the ice margin likely receded to the east up the North Thompson River toward the accumulation areas on the Cariboo Mountains. Ice retreat was probably dynamic for the most part, however, numerous kettle lakes and areas of hummocky moraine, mainly over the plateau area south of Taweel Lake, suggests that the some stagnant ice masses remained. Numerous short-lived meltwater channels were produced as base levels continually dropped. There were likely numerous proglacial lakes but glaciolacustrine deposits are rare or limited to isolated sand bodies. However, remnant ice lobes in the larger valleys created temporary glacial lakes as evidenced by extensive silt terraces along the North Thompson River valley just south of the map area. Glaciofluvial deposits in much or the area are thought to relate to deposition by meltwater during deglaciation. An exception to this is found at the confluence of the Clearwater and North Thompson rivers where thick glaciofluvial gravels exposed in sections are partially covered by a surface till. Some water well logs in the vicinity of Clearwater record thick gravel deposits beneath several metres of till. It is clear that a glacial advance occurred over pre-existing gravels. Some of these gravels may predate glaciation if the North Thompson valley was a depositional trough since the Tertiary. This is likely given that the valley is deeply incised and runs along a prominent lithological boundary. Purpose: Supplemental_Information: Data set is in English. Magnetic declination stated in degrees and minutes. Annual change stated in minutes. Magnetic declination at NW corner of map: 17°59'E, changing 14.3'W annually. Magnetic declination at SW corner of map: 17°53'E, changing 14.1'W annually. Magnetic declination at NE corner of map: 17°52'E, changing 14.3'W annually. Magnetic declination at SE corner of map: 17°47'E, changing 14.1'W annually. Magnetic declination at center of map: 17°53'E, changing 14.2'W annually. Number of base data sets used: 1 Base data set 1: Source is B.C. Trim Data, ID is unknown, version unknown, unknown, scale 1:50000 Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2008 Range_of_Dates/Times: Beginning_Date: 2008 Ending_Date: 2008 Currentness_Reference: Field work years are 2008. Compilation years are 2008. Status: Progress: Complete Maintenance_and_Update_Frequency: None Planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -120.500 East_Bounding_Coordinate: -120.000 North_Bounding_Coordinate: 51.750 South_Bounding_Coordinate: 51.500 Data_Set_G-Polygon: Data_Set_G-Polygon_Outer_G-Ring: G-Ring_Point: G-Ring_Latitude: 51.7500 G-Ring_Longitude: -120.4925 G-Ring_Point: G-Ring_Latitude: 51.7500 G-Ring_Longitude: -120.0000 G-Ring_Point: G-Ring_Latitude: 51.5000 G-Ring_Longitude: -120.0000 G-Ring_Point: G-Ring_Latitude: 51.5000 G-Ring_Longitude: -120.5000 G-Ring_Point: G-Ring_Latitude: 51.5933 G-Ring_Longitude: -120.5000 G-Ring_Point: G-Ring_Latitude: 51.7500 G-Ring_Longitude: -120.5000 G-Ring_Point: G-Ring_Latitude: 51.7500 G-Ring_Longitude: -120.4925 Keywords: Theme: Theme_Keyword: geoscientificInformation Theme_Keyword: Geological and geophysical Theme_Keyword: Surficial geology Theme_Keyword_Thesaurus: None Place: Place_Keyword: Rioux Lake Place_Keyword: Coldscaur Lake Place_Keyword: Reflector Lake Place_Keyword: Grizzly Lakes Place_Keyword: Surprise Lake Place_Keyword: Queen Bess Ridge Place_Keyword: Hallamore Lake Place_Keyword: Star Lake Place_Keyword: Taweel Lake Place_Keyword: North Thompson River Place_Keyword: Dutch Lake Place_Keyword: Lolo Lake Place_Keyword: Pooytl Mountain Place_Keyword: Skwilkwakult Mountain Place_Keyword: Skwilatin Mountain Place_Keyword: Grizzly Moutain Place_Keyword: Mount Heger Place_Keyword: Grizzly Cub Moutain Place_Keyword: Clearwater Place_Keyword: Blackpool Place_Keyword: British Columbia Place_Keyword_Thesaurus: None Access_Constraints: None Use_Constraints: Her Majesty the Queen in Right of Canada 2009 For more information, please contact the Copyright Officer at the following address: ESS Copyright Officer Business Development Office Earth Sciences Sector 615 Booth St., Ottawa, Ontario K1A 0E9 Sa Majesté la Reine du chef du Canada 2009 Pour plus d'information, prière de communiquer avec le responsable du droit d'auteur à l'adresse suivante : Responsable du droit d'auteur du SST Bureau d'expansion des affaires Secteur des sciences de la Terre 615, rue Booth Ottawa (Ontario) K1A 0E9 Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jan Bednarski Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 9860 West Saanich Road, P.O.Box 6000 City: Sidney State_or_Province: British Columbia Postal_Code: V8L 4B2 Country: Canada Contact_Voice_Telephone: 250-363-6344 Contact_Facsimile_Telephone: 250-363-6565 Contact_Electronic_Mail_Address: Jan.Bednarski@NRCan.gc.ca Data_Set_Credit: Digital cartography by Coulthart, M.J. Data_Quality_Information: Lineage: Source_Information: Source_Scale_Denominator: 50000 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: 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: 0.9996 Longitude_of_Central_Meridian: -123.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.000 Ordinate_Resolution: 1.000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.25722209603690666513255949227 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Mike Sigouin Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E8 Country: Canada Contact_Voice_Telephone: 613-943-0738 Contact_Facsimile_Telephone: 613-952-7308 Contact_Electronic_Mail_Address: msigouin@NRCan.gc.ca Resource_Description: Live Data and Maps Standard_Order_Process: Fees: None Metadata_Reference_Information: Metadata_Date: 20091027 Metadata_Future_Review_Date: 20141027 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Paul Huppé Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: V8L 4B2 Postal_Code: K1A 0E8 Country: Canada Contact_Voice_Telephone: 613-943-0996 Contact_Facsimile_Telephone: 613-995-2339 Contact_Electronic_Mail_Address: huppe@NRCan.gc.ca Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998