Indian Point Formation
{{Infobox rockunit
| name = Indian Point Formation
| image =
| caption =
| type = Formation
| age = Ludlow epoch
~{{fossil range|423|419}}
| period = Ludlow
| prilithology = Sandstone, siltstone, calcarenite
| otherlithology = Biostromal limestone, conglomerate, mafic volcanic rock
| namedfor =
| namedby =
| year_ts =
| region = Quebec
| country = {{CAN}}
| coordinates = {{coord|48.8|N|64.5|W|display=inline,title}}
| paleocoordinates = {{coord|26.6|S|29.7|W|display=inline}}
| unitof =
| subunits =
| underlies = Archibald Settlement Formation
| overlies =
| thickness =
| extent = Gaspe National Park
| area =
| map = {{Location map+ | Canada#Canada Quebec
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | Canada#Canada Quebec
| lat_deg = 48.8
| lon_deg = -64.5
| mark = SpringGreen pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
The Indian Point Formation is a geologic formation in Quebec. It preserves fossils dating back to the Ludlow epoch of the Silurian period.[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Indian%20Point&group_formation_member=Indian%20Point Indian Point Formation] at Fossilworks.org
Description
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.[https://paleobiodb.org/classic/displayCollResults?collection_no=14198 Eurypterid-associated biota of Indian Point Fmn. in Gaspe National Park] at Fossilworks.org
Fossil content
The following fossils were reported from the formation:Plotnick, 1999
= Eurypterids =
= Pterobranchia =
See also
- List of fossiliferous stratigraphic units in Quebec
- Bertie Formation, Silurian Lagerstätte in Ontario
- Charlevoix impact structure, Silurian impact structure in Quebec
References
{{reflist|3}}
= Bibliography =
- {{citation |last=Plotnick |first=R. E |year=1999 |title=Habitat of Llandoverian-Lochkovian eurypterids |publisher=in A. J. Boucot, J. D. Lawson (eds.), Paleocommunities - a case study from the Silurian and Lower Devonian |pages=106–136}}
Category:Geologic formations of Quebec
Category:Silurian System of North America
Category:Sandstone formations of Canada
Category:Siltstone formations of Canada
Category:Conglomerate formations of Canada