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GEOREF RECORD

In-situ aptychus in Cleviceras from the Mulgrave Shale Member of the Whitby Mudstone Formation (Jurassic) of Port Mulgrave, Whitby

Richard Maddra
In-situ aptychus in Cleviceras from the Mulgrave Shale Member of the Whitby Mudstone Formation (Jurassic) of Port Mulgrave, Whitby
Proceedings of the Yorkshire Geological Society (March 2022) 64 (1)

Abstract

A specimen of the ammonoid Cleviceras (Hildoceratidae), collected at Port Mulgrave, near Whitby, North Yorkshire, shows an in-situ aptychus in the body chamber. The precise stratigraphic origin of the specimen is unknown, but the lithology and generic identity are compatible with derivation from the Mulgrave Shale Member of the Whitby Mudstone Formation. The specimen is the first in-situ jaw apparatus to be reported for this genus from Britain. A second loose specimen, a Harpoceras sp. with in-situ aptychus was found and photographed at Deepgrove Wyke, but was too friable to be collected. Both specimens reinforce previous observations that the aptychus form type Cornaptychus is characteristic of the ammonite family Hildoceratidae.


ISSN: 0044-0604
EISSN: 2041-4811
Coden: PYGSAB
Serial Title: Proceedings of the Yorkshire Geological Society
Serial Volume: 64
Serial Issue: 1
Title: In-situ aptychus in Cleviceras from the Mulgrave Shale Member of the Whitby Mudstone Formation (Jurassic) of Port Mulgrave, Whitby
Author(s): Maddra, Richard
Affiliation: 14, Parkside Avenue, Queensbury, United Kingdom
Pages: Paper no. pygs2019-001
Published: 20220317
Text Language: English
Publisher: Yorkshire Geological Society, Leeds, United Kingdom
References: 13
Accession Number: 2022-019510
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N54°32'60" - N54°32'60", W00°46'00" - W00°46'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202216
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