Stewart, Sarah E (2011) Distribution and palaeolecology of Ordovician bivalves and gastropods from Girvan, SW Scotland. Earth and Environmental Science Transactions of the Royal Society of Edinburgh , 102 (3). pp. 145-158. ISSN 1755-6910

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Molluscs from the Middle and Upper Ordovician succession of Girvan, SW Scotland are common and diverse in some localities. The mollusc fauna consists mainly of gastropods, bivalves and various univalved molluscs (mimospirids and tergomyans), along with scarcer polyplacophorans, rostroconchs and cephalopods. The present study gives an overview of the distribution and palaeoecology of bivalves, gastropods and univalved molluscs and compares them with mollusc faunas worldwide. Gastropods, mimospirids and tergomyans are present from the Darriwilian (mid Llanvirn) onwards in both siliciclastic and carbonate facies, and increase in diversity through the Sandbian (Caradoc) and into the Katian (Ashgill). Bivalves first appeared in Girvan in the late Darriwilian (early Caradoc) in deep water siliciclastic facies; where they continued to be more abundant and diverse than in equivalent carbonate facies. Molluscs are initially Laurentian in aspect, though peri-Gondwanan faunal elements occur, particularly during the Sandbian. The pattern of bivalve and gastropod diversity found in the Ordovician of Girvan generally follows that of the known global diversity for these groups.

Item Type: Article
Uncontrolled Keywords: bivalvia; gastropoda; Laurentia; mollusca
Subjects: Q Science > QH Natural history > QH301 Biology
Theme: Understanding the natural world
Department: Natural Sciences
Depositing User: Mark Glancy
Date Deposited: 18 Jan 2013 10:59
Last Modified: 18 Jan 2013 10:59

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