Hulcross Formation
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| Hulcross Formation | |
|---|---|
| Stratigraphic range: Late Albian | |
| Type | Formation |
| Unit of | Fort St. John Group |
| Underlies | Boulder Creek Formation |
| Overlies | Gates Formation |
| Thickness | Up to 135 metres (440 ft)[1] |
| Lithology | |
| Primary | Shale, mudstone |
| Other | Siltstone |
| Location | |
| Region |  British Columbia |
| Country |  Canada |
| Type section | |
| Named for | Mount Hulcross |
| Named by | Wickenden and Shaw[2] |
The Hulcross Formation is a geologic formation in the Western Canada Sedimentary Basin in northeastern British Columbia that was deposited in marine environments during the late Albian stage of the Early Cretaceous period. At one time considered to be a member of the Commotion Formation, it was elevated to formation status by D.F. Stott in 1982.[3] It preserves ammonites and other fossils.[1][3]
Thickness and Distribution
The Hulcross Formation is present in northeastern British Columbia throughout the foothills of the Canadian Rockies between the Peace and Kakwa Rivers, where it reaches thicknesses of up to 135 metres (440 ft). It is exposed along the Peace River eastward from the foothills almost as far as its confluence with the Halfway River.[1]
