Indian Point Formation
| Indian Point Formation | |
|---|---|
| Stratigraphic range: Ludlow epoch ~ | |
| Type | Formation |
| Underlies | Archibald Settlement Formation |
| Lithology | |
| Primary | Sandstone, siltstone, calcarenite |
| Other | Biostromal limestone, conglomerate, mafic volcanic rock |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Approximate paleocoordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | Quebec |
| Country | File:Flag of Canada (Pantone).svg Canada |
| Extent | Gaspe National Park |
Indian Point Formation (Canada) Indian Point Formation (Quebec) | |
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The Indian Point Formation is a geologic formation in Quebec. It preserves fossils dating back to the Ludlow epoch of the Silurian period.[1]
Description
[edit | edit source]The Indian Point Formation comprises thin- to thick-bedded, locally fossiliferous, calcareous siltstones, fine-grained sandstones, calcarenites, and minor biostromal limestones, conglomerates, red siltstones, and mafic volcanic rocks. The Indian Point Formation is conformably overlain by within-plate tholeiitic mafic to intermediate flows and flow breccias of the Archibald Settlement Formation, developed as a synsedimentary normal fault in the Late Silurian, based on the presence of polymictic conglomerate beds in a thickened Indian Point section east of the fault. Post-Early Devonian (Acadian) orogenic events have produced open to close folds with northeast-trending axes.[2]
Fossil content
[edit | edit source]The following fossils were reported from the formation:[1][3]
Eurypterids
[edit | edit source]Pterobranchia
[edit | edit source]See also
[edit | edit source]- List of fossiliferous stratigraphic units in Quebec
- Bertie Formation, Silurian Lagerstätte in Ontario
- Charlevoix impact structure, Silurian impact structure in Quebec
References
[edit | edit source]- ^ a b Indian Point Formation at Fossilworks.org
- ^ Eurypterid-associated biota of Indian Point Fmn. in Gaspe National Park at Fossilworks.org
- ^ Plotnick, 1999
Bibliography
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