Grewingkia canadensis (fossil rugose corals) (Upper Ordovician; Cincinnati area, Ohio, USA) 2

Grewingkia canadensis (Billings, 1862) - horn corals in fossiliferous limestone from the Ordovician of Ohio, USA. (CMC IP 81956, Cincinnati Museum of Natural History & Science, Cincinnati Museum Center, Cincinnati, Ohio, USA)

The famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana has some of the richest fossiliferous rocks on Earth. Cincinnatian rocks were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms.

The fossils seen here are solitary rugose corals, an extinct group of solitary and colonial cnidarians. They are often nicknamed "horn corals", in reference to the upside-down horn shape of the skeletons of solitary forms (Ex: www.flickr.com/photos/jsjgeology/15590522272). Solitary rugose corals made solid, tapering skeletons of calcite (CaCO3 - calcium carbonate). During life, a polyp (sea anemone animal) lived in a cup-like depression at the top of the skeleton.

Classification: Animalia, Cnidaria, Anthozoa, Rugosa, Streptelasmatidae

Stratigraphy: unrecorded unit in the Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician

Locality: unrecorded / undisclosed site at or near the town of Cincinnati, southwestern Ohio, USA
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Info. at:
en.wikipedia.org/wiki/Rugosa

Some rights reserved

Taken on: May 4, 2024

Tags:

Grewingkia

canadensis

limestone

limestones

fossil

rugose

corals

coral

fossils

rugosans

Rugosa

Cincinnatian

Series

Richmond

Richmondian

Stage

Group

Ordovician

Cincinnati

Ohio « less

Sets appears in: • Ohio Rocks, Minerals, Fossils • Rugose Corals more » • Ordovician Rocks & Fossils • Cincinnatian Fossils and Rocks (Upper Ordovician of the Cincinnati, Ohio region, USA) • Coral Fossils « less

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