Identification Information:
Citation:
Citation Information:
Originator: Alberta Energy and Utilities Board
Originator: Alberta Geological Survey
Originator: Pawlowicz, J.G.
Originator: Fenton, M.M.
Originator: Hickin, A.S.
Originator: Nicoll, T.J.
Originator: Paulen, R.C.
Originator: Plouffe, A.
Originator: Smith, I.R.
Publication Date: 200512
Title: Bedrock Topography of Zama Lake Area, Alberta (NTS 84L)
Geospatial Data Presentation Form: map
Series Information:
Series Name: Maps
Issue Identification: MAP 328
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Other Citation Details: Scale 1:250000.
Description:
Abstract:
The bedrock topography map shows the elevation of the bedrock surface. In general, the bedrock topography controls the surface topography in the map area. Rainbow Ridge, Bassett Hill and the Chinchaga Plain are generally underlain by bedrock highs. Rainbow Ridge and other westerly trending bedrock ridges parallel the regional ice flow (Paulen et al., 2005a and 2005b; Plouffe et al., 2004; Smith et al., 2005) suggesting modification by glacial erosion. Major buried valleys lie within the Fort Nelson Lowland and the Rainbow Lake Plain. The elevation of the bedrock rises to >700 m asl in the uplands, similar to the land surface. The elevations in the lowest parts of the buried valleys differ markedly from the land surface in that they are as low as 25 m asl compared to a minimum ground surface elevation of 335 m asl. Two major northwesterly trending buried valleys that extend into British Columbia are the Rainbow Valley in the south and the Zama Valley in the north. A deeply incised depression located within the Zama Valley in Township 110, Range 3, west of the 6th Meridian has eroded through the entire Cretaceous bedrock sequence, including gas-bearing sandstones of the Bluesky Formation, and into the Devonian Wabamun Group limestone down to an elevation of 25 m asl. Buried valleys are one factor that may contribute to the presence of shallow gas within drift, which is known to occur in the Zama Valley within Township 110, Range 3, west of the 6th Meridian, and elsewhere in the Zama Lake region.
Purpose:
To map the topography of the bedrock surface of map area NTS 84L at 1:250 000 scale in support of northern Alberta mapping.
Supplemental Information:

The Zama Lake (NTS 84L) bedrock topography and drift thickness maps were completed as an Alberta Geological Survey and Geological Survey of Canada collaborative contribution to Northern Resources Development Project 4450, Shallow Gas and Diamond Opportunities in Northern Alberta and British Columbia 2003-2007, with funding support from the second phase of the Targeted Geoscience Initiative program. Petrophysical logs from oil and gas wells were the primary source of information used for constructing the bedrock topography. A suite of the common well logs (gamma, resistivity, spontaneous potential, density, neutron, sonic and caliper) were useful in making the pick for top of bedrock; however, the gamma and resistivity logs proved to be the most useful. In this region the drift typically displays a lower gamma response and higher resistivity response than the underlying bedrock. Other sources of data were drill cuttings, water well lithologs and surficial geological mapping that provided information on bedrock outcrop locations and till veneers over shallow bedrock (EUB/AGS Maps 315 and 316, GSC Open Files 4637 and 4754).

Mapping the bedrock surface was difficult in some areas where data were sparse. In many of the wells, log traces are not available for the upper part of the hole. The depth of surface casing set in bedrock provides a limit on the maximum possible drift thickness. Conversely, water wells and gas wells that did not intersect bedrock provide minimum drift thickness values. The bedrock topography contours were initially generated from bedrock surface picks using a computer-contouring program with subsequent modifications to better reflect the geological model.

Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 2003
Ending Date: 2005
Currentness Reference: process date
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -120
East Bounding Coordinate: -118
North Bounding Coordinate: 59
South Bounding Coordinate: 58
Keywords:
Theme:
Theme Keyword Thesaurus:
Theme Keyword: bedrock topography
Theme Keyword: buried valley
Theme Keyword: drift thickness
Theme Keyword: glacial drift
Theme Keyword: overburden
Theme Keyword: shallow gas
Theme Keyword: thalweg
Place:
Place Keyword Thesaurus:
Place Keyword: 84l
Place Keyword: alberta
Place Keyword: canada
Place Keyword: rainbow lake
Place Keyword: zama lake
Access Constraints: Public
Use Constraints: Credit to originator/source required. Commercial reproduction not allowed.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Communications Advisor
Contact Position: Communications Advisor
Contact Address:
Address Type: mailing and physical
Address: Alberta Energy and Utilities Board
Address: 4th Floor, Twin Atria Building
Address: 4999-98 Avenue
City: Edmonton
State or Province: Alberta
Postal Code: T6B 2X3
Country: Canada
Contact Voice Telephone: (780) 422-3767
Contact Facsimile Telephone: (780) 422-1918
Contact Electronic Mail Address: eub.ags-infosales@gov.ab.ca
Hours of Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Data Set Credit: M. Price; Base data provided by Spatial Data Warehouse Ltd.
Distribution Information:
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Information Sales Coordinator
Contact Position: Information Sales Coordinator
Contact Address:
Address Type: mailing and physical
Address: Alberta Energy and Utilities Board
Address: 4th Floor, Twin Atria Building
Address: 4999-98 Avenue
City: Edmonton
State or Province: Alberta
Postal Code: T6B 2X3
Country: Canada
Contact Voice Telephone: (780) 422-3767
Contact Facsimile Telephone: (780) 422-1918
Contact Electronic Mail Address: eub.ags-infosales@gov.ab.ca
Hours of Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Distribution Liability:
The Alberta Energy and Utilities Board/Alberta Geological Survey (EUB/AGS) and its employees and contractors make no warranty, guarantee or representation, express or implied, or assume any legal liability regarding the correctness, accuracy, completeness or reliability of this publication. The data are supplied on the understanding that they are for the sole use of the user and will not be redistributed in any form, in whole or in part, to third parties. Any references to proprietary software in our documentation, and/or any use of proprietary data formats in our releases, do not constitute endorsement by the EUB/AGS of any manufacturer's product.
Metadata Reference Information:
Metadata Date: 20051107
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Communications Advisor
Contact Position: Communications Advisor
Contact Address:
Address Type: mailing and physical
Address: Alberta Energy and Utilities Board
Address: 4th Floor, Twin Atria Building
Address: 4999-98 Avenue
City: Edmonton
State or Province: Alberta
Postal Code: T6B 2X3
Country: Canada
Contact Voice Telephone: (780) 422-3767
Contact Facsimile Telephone: (780) 422-1918
Contact Electronic Mail Address: eub.ags-infosales@gov.ab.ca
Hours of Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time
Metadata Access Constraints: none
Metadata Use Constraints: none