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Deciphering the geology of some Darriwilian–Sandbian (Ordovician) ‘ghost’ formations in the UK and North America using olistoliths in marine debris flows

Published online by Cambridge University Press:  29 May 2017

STIG M. BERGSTRÖM  and
ANNALISA FERRETTI
STIG M. BERGSTRÖM*
Affiliation:
Division of Earth History, School of Earth Sciences, The Ohio State University, 125 S. Oval Mall, Columbus, OH 43210, USA
ANNALISA FERRETTI
Affiliation:
Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via Campi 103, 41125 Modena, Italy
*
†Author for correspondence: [email protected]
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Abstract

Olistostromes with calcareous olistoliths are rare components in the Ordovician successions in NW Europe and North America, having been described from only a small number of localities. One of the best exposed, but least known, is in the Garn Formation in coastal outcrops in Anglesey in northwestern Wales. Here, in the graptolite-bearing shales of the Garn Formation, there are numerous limestone olistoliths that are derived from an otherwise unknown ‘ghost’ formation whose original depositional site remains an enigma. These olistoliths contain a Baltoscandian type of conodont fauna that is otherwise unknown in Wales and England. It represents the Baltoniodus variabilis Subzone of the Amorphognathus tvaerensis Zone. Similar, but slightly older, conodont faunas are recorded from olistoliths in the Tweeddale Member of the Shinnel Formation in southern Scotland and in probable olistoliths of the Cobbs Arm Limestone in northeasternmost Newfoundland. Approximately coeval conodont faunas are present in calcareous olistoliths in the Woods Hollow Shale of West Texas and the Womble Shale in the Ouachita Mountains of Arkansas, USA. Lithological and conodont evidence indicates that the calcareous olistoliths were derived from carbonate sediments deposited in relatively shallow water. It is concluded that the study of ‘ghost’ formation olistoliths may provide otherwise unavailable but important data bearing on the marine depositional history of a particular region.

Keywords

conodont biostratigraphyOrdovicianolistolithspalaeobiogeographyRecurrent Species Associations
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 7 , October 2018 , pp. 1507 - 1522
Copyright
Copyright © Cambridge University Press 2017 

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