It is one of the datasets used to produce Alberta
Geological Survey (AGS) Map 600.
This dataset represents the compilation of existing geological maps
and original geological mapping by AGS staff. Mapping in support of the
dataset included field observations and creating three-dimensional
models of subsurface stratigraphy based on the interpretation of
geophysical logs from oil and gas wells. Each three-dimensional
formation surface was projected to a model of the bedrock surface, and
the intersection formed the first approximation of the position of the
geological contact at the base of the surficial deposits. We adjusted
these preliminary contacts to honour outcrop data and the interpretation
of the bedrock unit immediately below surficial deposits in individual
wells.
The data were created in geodatabase format and output for public distribution in shapefile format.
AGS Open File Report 2013-02 presents additional information on data sources related to this dataset.