Uppermost Cretaceous and Tertiary Subcrop Geology Polygons for Western Canada

Polygon features represent the subsurface geology of the Western Canada Sedimentary Basin. The data was created by the Alberta Geological Survey in the mid-1990s and later edited in 2005-2006. It is part of the Geological Atlas of the Western Canada Sedimentary Basin.

Use Cases

• Map geological unit boundaries and subcrop extents using polygon geometry and attribute data.
• Analyze spatial relationships between Cretaceous and Tertiary strata features within the sedimentary basin.
• Integrate polygon features with other subsurface datasets for basin-scale geological modeling.
• Study the distribution and continuity of specific stratigraphic units identified in the polygon attributes.

Strengths

• Data is attributed and consolidated into single files by feature type.
• Polygons represent a specific, documented figure (Figure 1) from a reference atlas chapter.

Limitations

• Original digital files are from the mid-1990s, potentially using outdated methodologies.
• Specific row counts, column names, and sample data are unavailable for assessment.

Provenance

Source

Alberta Geological Survey, Government of Alberta.

Collection Method

Shapefiles produced from archived digital files, edited to correct, attribute, and consolidate.

Time Range

Geological time range: Uppermost Cretaceous and Tertiary periods.

Freshness

Last platform update was 2026 -03-04, though the core data is from 2005-2006 edits of 1990s files.

Geography

Western Canada Sedimentary Basin.