| St. Mary River Formation | |
|---|---|
| Stratigraphic range: | |
 Strata of the St. Mary River Formation at the St. Mary Reservoir spillway. | |
| Type | Geological formation |
| Underlies | Willow Creek Formation |
| Overlies | Bearpaw Formation |
| Thickness | up to 762 metres (2,500 ft) |
| Lithology | |
| Primary | Sandstone, shale[1] |
| Other | Mudstone, coal |
| Location | |
| Coordinates | 49°36′N 114°06′W / 49.6°N 114.1°W |
| Approximate paleocoordinates | 49°36′N 86°30′W / 49.6°N 86.5°W |
| Region |  Alberta, Montana |
| Country |  Canada, USA |
| Type section | |
| Named for | St. Mary River |
| Named by | George Mercer Dawson[2] |
| Year defined | 1883 |
  St. Mary River Formation (Canada)  St. Mary River Formation (Alberta) | |
The St. Mary River Formation is a geologic formation of Late Cretaceous (71.9-67 Ma[3]) age of the Western Canada Sedimentary Basin in southwestern Alberta and northwesternmost Montana.[4][5] It was first described from outcrops along the St. Mary River by George Mercer Dawson in 1883, and it takes its name from the river.
Fossils from the formation include remains of dinosaurs,[6] as well as bivalve shells, plant fossils, and trace fossils.[7]
- ^ Lexicon of Canadian Geologic Units. "St. Mary River Formation". Retrieved 2010-01-01.
- ^ Dawson, G.M., 1883. Preliminary report on the geology of the Bow and Belly river region, Northwest Territory, with special reference to the coal deposits. Geological Survey of Canada, Report of Progress for 1880-81-82, Part B.
- ^ Fowler, Denver Warwick (2017-11-22). "Revised geochronology, correlation, and dinosaur stratigraphic ranges of the Santonian-Maastrichtian (Late Cretaceous) formations of the Western Interior of North America". PLOS ONE. 12 (11): e0188426. Bibcode:2017PLoSO..1288426F. doi:10.1371/journal.pone.0188426. ISSN 1932-6203. PMC 5699823. PMID 29166406.
- ^ Mossop, G.D. and Shetsen, I., (compilers), Canadian Society of Petroleum Geologists (1994). "The Geological Atlas of the Western Canada Sedimentary Basin, Chapter 24: Upper Cretaceous and Tertiary strata of the Western Canada Sedimentary Basin". Archived from the original on 2013-07-21. Retrieved 2013-08-01.
{{cite web}}: CS1 maint: multiple names: authors list (link) - ^ Prior, G. J., Hathaway, B., Glombick, P.M., Pana, D.I., Banks, C.J., Hay, D.C., Schneider, C.L., Grobe, M., Elgr, R., and Weiss, J.A. (2013). "Bedrock Geology of Alberta. Alberta Geological Survey, Map 600". Archived from the original on 2013-07-05. Retrieved 2013-08-13.
{{cite web}}: CS1 maint: multiple names: authors list (link) - ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press, pp. 574-588. ISBN 0-520-24209-2.
- ^ Hamblin, A. P. (1998). "Edmonton Group/St Mary River Formation: Summary of Literature and Concepts. Geological Survey of Canada, Open File 3578" (PDF). Retrieved 2014-01-31.[permanent dead link]