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The AAPG/Datapages Combined Publications Database

CSPG Special Publications


Proceedings of the Symposium on the Geology of the Canadian Arctic, 1973
Pages 143-157

Lithologies and Depositional Environments of the Allen Bay-Read Bay Formations (Ordovician-Silurian) on Svendsen Peninsula, Central Ellesmere Island

Ulrich Mayr


On Svendsen Peninsula, central Ellesmere Island, up to 3,800 feet (1160 m) of carbonates of the Allen Bay-Read Bay Formations are exposed. These carbonates are replaced westwards by the shales of the Cape Phillips Formation.

The rock types of the Allen Bay-Read Bay Formations are varied, and include dark basinal lime mudstone, winnowed skeletal sand and oolite, and supratidal algal carbonates. Six depostional environments can be distinguished on the basis of lithology: 1. basinal environment, 2. basin margin environment, 3. basin slope and shelf edge environment, 4. winnowed shelf evironment, 5. unwinnowed shelf environment, and 6. mixed shelf environment.

Reefal development took place in three distinct, successive periods during the time from Late Ordovician to Late Silurian. Carbonates of the second period (Llandoverian-Wenlockian) have the largest regional extent and were deposited in a main reef front in the Vendom Fiord area and in a system of shoals and channels farther west.

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