On the occurrence of Eupachycrinus (Crinoidea) in Trearne Quarry SSSI (Mississippian, Lower Carboniferous), North Ayrshire, Scotland

Gary Hoare; Stephen K. Donovan

doi:10.1144/sjg2026-001

July 10, 2026Scottish Journal of GeologyOpen Access

On the occurrence of Eupachycrinus (Crinoidea) in Trearne Quarry SSSI (Mississippian, Lower Carboniferous), North Ayrshire, Scotland

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Key Points

To document the first occurrence of the crinoid Eupachycrinus macneanensis in the Mississippian period in Scotland.
Reported specimens collected from Trearne Quarry, a Site of Special Scientific Interest in North Ayrshire.
Analyzed morphological features of Eupachycrinus macneanensis including cup shape and plate structures.
Eupachycrinus macneanensis is described with a bowl-shaped cup and distinct plate characteristics.
It is identified as the tenth nominal crinoid species at Trearne Quarry.
Findings contribute to the understanding of crinoid diversity during the Mississippian period.

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Implication

Newly discovered Eupachycrinus species reveals insights into Mississippian fossils in Scotland, highlighting biodiversity.

Abstract

The cladid crinoid Eupachycrinus macneanensis Wright is reported from the Mississippian of south-west Scotland for the first time. Specimens are from Trearne Quarry, North Ayrshire, a Site of Special Scientific Interest (SSSI); Blackhall Limestone Member, Lower Limestone Formation, Clackmannan Group; Brigantian (Visean, Mississippian, Lower Carboniferous). Eupachycrinus macneanensis has a shallow, bowl-shaped cup with a coarse, granular-vermiculate sculpture; infrabasals just visible in side view; basals, radials and anal plates tumid with deeply indented sutures; radianal, and lower part of anal X and right proximal plate of anal tube in cup. It is the tenth nominal crinoid species to be recognised from this site.

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Hoare et al. (2026) studied this question.

synapsesocial.com/papers/6a5330a44f7abc118aded544 https://doi.org/10.1144/sjg2026-001

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On the occurrence of Eupachycrinus (Crinoidea) in Trearne Quarry SSSI (Mississippian, Lower Carboniferous), North Ayrshire, Scotland

Key Points

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Abstract

Discussion

Cite This Study

On the occurrence of Eupachycrinus (Crinoidea) in Trearne Quarry SSSI (Mississippian, Lower Carboniferous), North Ayrshire, Scotland

Key Points

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Abstract

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