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Trace fossils and tropical karst

Published online by Cambridge University Press:  04 February 2016

STEPHEN K. DONOVAN
STEPHEN K. DONOVAN*
Affiliation:
Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands
*
†Author for correspondence: [email protected]
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Abstract

Two crinoid pluricolumnals from Permian rocks of Timor show similar patterns of external pitting. Platycrinitid sp. preserves circular, parabolic pits that do not cross-cut between columnals, some have raised rims and at least one columnal shows a growth deformity. These pits are interpreted as the trace fossil Oichnus paraboloides Bromley. Crinoid sp. indet. has particularly dense pits cross-cutting columnals on one side of the pluricolumnal only and extending onto the contiguous limestone; it is a Holocene microkarstic solution feature. Care must be taken to separate true bioerosive trace fossils from modern microkarstic features in limestones in the tropics.

Keywords

PermianTimorcrinoidsOichnus paraboloidesmicrokarst
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 1 , January 2017 , pp. 166 - 168
Copyright
Copyright © Cambridge University Press 2016 

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