Identification Information:
Citation:
Citation Information:
Originator: Alberta Energy and Utilities Board
Originator: Alberta Geological Survey
Originator: Pawlowicz, J.G.
Originator: Fenton, M.M.
Publication Date: 200503
Title: Drift Thickness of Peerless Lake Area, Alberta (NTS 84B)
Geospatial Data Presentation Form: map
Series Information:
Series Name: Maps
Issue Identification: Map 253
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Description:
Abstract:
The drift thickness map of the Peerless Lake area (NTS 84B) shows the variation in thickness of unconsolidated sediment lying between the bedrock surface and the present-day land surface, and complements the Drift Thickness of Alberta map. The thickness of the drift varies from locally less than 2 metres in Buffalo Head Hills to over 200 metres in the Loon River Lowland in the central part of the map area. Thick drift fills the major paleovalleys, which are the Muskwa Valley, the Red Earth Valley and Gods Valley. The drift is thinnest on the Peerless Lake Upland, the Utikuma Uplands and the Buffalo Head Hills Upland. In general the areas of thin drift correspond to areas where the bedrock topography is high. Exceptions are the hills composed of thick drift, such as the ones located south of Muskwa Lake and southwest of Peerless Lake. These features are likely hill-hole pairs produced by glaciotectonism with lakes occupying the source depressions (holes). The drift also thickens in the southwestern part of the Utikuma Uplands. Experience from more detailed investigations in eastern Alberta have shown that unmapped, narrow, deep drift-filled channels are to be expected.
Purpose:
To map the drift thickness of map area NTS 84B at 1:250,000 scale in support northern Alberta mapping.
Supplemental Information:
The drift thickness map represents the thickness of overburden between the land surface and the bedrock surface. Petrophysical logs 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 calliper) were useful in making the pick for top of bedrock; however, the gamma and resistivity logs proved to be the most useful. The drift typically displays a lower gamma response and higher resistivity response than the underlying bedrock. Other sources of data were water well lithologs, mineral exploration drillholes and outcrop information. Mapping the bedrock surface was difficult in some areas where data were sparse. Many of the log traces were absent from the upper part of the hole because of surface casing. The depth of surface casing set in bedrock was used for an estimate of maximum drift thickness in places with few data. Conversely, many water wells did not penetrate deep enough to intersect the bedrock, so only a minimum drift thickness value could be determined. The drift thickness interpretation was made after completion of the bedrock topography contouring. The bedrock topography contours were initially generated from bedrock surface picks using a computer-contouring program with some subsequent modifications by hand. The bedrock topography surface, in a digital grid format, was subtracted from a digital elevation model of the present-day surface. The resulting grid was then contoured to form an isopach map of the drift. Preliminary versions of this map were released as Alberta Geological Survey publications by Pawlowicz and Fenton (2002) and Andriashek et al. (2001).
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 2000
Ending Date: 2002
Currentness Reference: process date
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -116
East Bounding Coordinate: -114
North Bounding Coordinate: 57
South Bounding Coordinate: 56
Keywords:
Theme:
Theme Keyword Thesaurus:
Theme Keyword: drift thickness
Theme Keyword: bedrock topography
Theme Keyword: buried valley
Theme Keyword: glacial drift
Theme Keyword: overburden
Theme Keyword: preglacial
Place:
Place Keyword Thesaurus:
Place Keyword: 84b
Place Keyword: alberta
Place Keyword: buffalo head hills
Place Keyword: canada
Place Keyword: peerless 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: Information Specialist
Contact Position: Information Specialist
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: N.L.Clark, E.J.Waters, G.J. Prior, M. Price
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: 20050224
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Information Specialist
Contact Position: Information Specialist
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