This is an online version of the out-of-print Geological Atlas of the Western Canada Sedimentary Basin, as well as digital data and shapefiles for some of the content. Please see our publications FAQ regarding the contours and map projections. You may also use our suggested citation format to cite the online version.
Three of the standard Lambert-projection parameters were determined on-the-fly: the central meridian and the first and second standard parallels. You can back-calculate these three values by examining their geographic extents and by using the below equations.
The central meridian is the line of longitude that is vertical on the page (i.e., it's exactly in the middle of the page).
The first standard parallel (or southern line of latitude) is the latitude 25% north of the southernmost latitude of the map.
The second standard parallel is the latitude 25% south of the northernmost latitude of the map.
For example, the map on Figure 5.12 spans from 96° west longitude on the east side of the map to 126° west longitude on the west side. Therefore, the central meridian is halfway between: 111° west longitude.
The map extends from 45° to 64° in a north-south direction. Therefore, the first standard parallel is at 49.75° north latitude.
45° + (64°-45°)/4 = 49.75°
The second standard parallel is at 59.25° north latitude.
64° - (64°-45°)/4 = 59.25°
The latitude of origin for all atlas maps is 0°.
Citation for the entire publication:
Mossop, G.D. and Shetsen, I., comp. (1994): Geological atlas of the Western Canada Sedimentary Basin; Canadian Society of Petroleum Geologists and Alberta Research Council, URL <http://www.ags.gov.ab.ca/publications/wcsb_atlas/atlas.html>, [Date last accessed online].
Citation for specific chapters, reference the corresponding author. Example:
O'Connell, S.C. (1994): Geological history of the Peace River Arch; in Geological Atlas of the Western Canada Sedimentary Basin, G.D. Mossop and I. Shetsen (comp.), Canadian Society of Petroleum Geologists and Alberta Research Council, URL <http://www.ags.gov.ab.ca/publications/wcsb_atlas/atlas.html>, [Date last accessed online].