The Red Mountain formation (Lower Pennsylvanian?) of the Chilliwack group (Carboniferous) was mapped in five areas of northwestern Washington. Except for a few outcrops of Devonian strata, the formation represents the oldest known sedimentary rocks in this region. It consists primarily of argillite, graywacke, chert, tuff and limestone, and is overlain
by conglomerate of the Black Mountain formation (Lower Permian). The base of the formation is nowhere exposed.
Correlation of the Red Mountain formation is dependent essentially on the presence of large crinoid stems, foraminifera, and similarity of stratigraphic relationships.
Limestones of the upper portion of the formation represent deposition
under conditions of marked tectonic stability, whereas enclosing strata are indicative of deposition in an unstable, subsiding realm. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/39006 |
| Date | January 1961 |
| Creators | Smith, Clyde Louis |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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