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Cambrian and Silurian ((L. Pyle, L. Gal) |
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Cambrian to Silurian strata in Peel Plateau and Plain lie unconformably on Proterozoic rocks, typically Katherine Group sandstone. The succession records the transition from an epicratonic sea in the Cambrian to passive continental margin setting in the Ordovician and Silurian. Study focused on regional stratigraphic relationships. Samples were taken for porosity (Cambrian sandstone and Cambrian to Silurian carbonate rock), and source rock potential (Cambrian shale).
Cambrian Mount Cap (up to 40 m thick) and Saline River Formation (up to 84 m thick) underlie the Cambro-Ordovician Franklin Mountain Formation. Mount Cap Formation contains mainly sandstone and Saline River Formation consists of siltstone, shale, and gypsum. Along the front of the Mackenzie Mountains, Franklin Mountain and Mount Kindle formations (Ronning Group) are extensive and thicken westward. Some coarse crystalline dolostone, and dolostone with vuggy surface weathering occur, in both the Cambrian-Ordovician Franklin Mountain Formation and the Ordovician-Silurian Mount Kindle Formation.
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Photo gallery
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Section of Mount Cap, Saline River, and Franklin Mountain formations at Fan Creek. |
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Mount Cap sandstone with abundant burrows. |
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Thick (>900 m) Ronning Group west of Arctic Red River. |
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Vuggy surface weathering of Mount Kindle dolostone, Gayna River Section. |
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Outputs |
Lower to Middle Paleozoic Stratigraphy and Measured Sections (NTS 106F,G,H,I) Northwest Territories Pyle LJ and Gal LP, NWT Open Report 2007-004. Download Now.
Stratiform coarse-grained and hydrothermal dolomite in Franklin Mountain Formation of northern Mackenzie Mountains (NTS 106G/05, 06); poster presented by Gal and Pyle at the Yellowknife Geoscience Forum November 21-23, 2006. Download now.
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