Indian Point Formation

The Indian Point Formation is a geologic formation in Quebec. It preserves fossils dating back to the Ludlow epoch of the Silurian period.[1]

Indian Point Formation
Stratigraphic range: Ludlow epoch
~423–419 Ma
↓
TypeFormation
UnderliesArchibald Settlement Formation
Lithology
PrimarySandstone, siltstone, calcarenite
OtherBiostromal limestone, conglomerate, mafic volcanic rock
Location
Coordinates48.8°N 64.5°W / 48.8; -64.5
Approximate paleocoordinates26.6°S 29.7°W / -26.6; -29.7
RegionQuebec
Country Canada
ExtentGaspe National Park
Indian Point Formation (Canada)
Indian Point Formation (Quebec)

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.[2]

Fossil content

The following fossils were reported from the formation:[1][3]

Eurypterids

Pterobranchia

See also

References
  1. Indian Point Formation at Fossilworks.org
  2. Eurypterid-associated biota of Indian Point Fmn. in Gaspe National Park at Fossilworks.org
  3. Plotnick, 1999

Bibliography
  • Plotnick, R. E. 1999. Habitat of Llandoverian-Lochkovian eurypterids, 106–136. in A. J. Boucot, J. D. Lawson (eds.), Paleocommunities - a case study from the Silurian and Lower Devonian.
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