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The Old Red Group (Devonian) – Rotliegend Group (Permian) unconformity in the Inner Moray Firth

The Old Red Group (Devonian) – Rotliegend Group (Permian) unconformity in the Inner Moray Firth
The Old Red Group (Devonian) – Rotliegend Group (Permian) unconformity in the Inner Moray Firth
A major stratigraphical problem in the offshore Paleozoic of the Inner Moray Firth is the identification of the top of the Devonian Old Red Sandstone Group beneath the lithologically similar Permian Rotliegend Group. Wireline log criteria for a revised Old Red Group to Permian boundary are given for the Inner Moray Firth. Section lines drawn using these criteria and flattened on the overlying Triassic Smith Bank or Permian Kupferschiefer formations show a relatively thin development of Rotliegend with two depocentres. The underlying Devonian when flattened on the Eday Marl shows a systematic subcrop pattern. There is currently no exposed onshore Old Red to Rotliegend boundary, but the possibility remains that a Permian section is present in the ‘Upper Old Red Sandstone’ of Tarbat in Easter Ross. An exposed Permian–Devonian boundary is present in East Greenland and provides an analogue for the Inner Moray Firth.
0305-8719
237-252
Marshall, J. E. A.
001d03a4-e8f1-49af-bc9f-4959dfe71ad8
Glennie, K. W.
0ea6220e-90b4-4bcf-aa3e-72b35952ebe5
Astin, T. R.
3d50d863-6559-4cfc-95d5-a9407673de91
Hewett, A. J.
1deb26b0-179b-444c-bb0f-a22aba1e354f
Marshall, J. E. A.
001d03a4-e8f1-49af-bc9f-4959dfe71ad8
Glennie, K. W.
0ea6220e-90b4-4bcf-aa3e-72b35952ebe5
Astin, T. R.
3d50d863-6559-4cfc-95d5-a9407673de91
Hewett, A. J.
1deb26b0-179b-444c-bb0f-a22aba1e354f

Marshall, J. E. A., Glennie, K. W., Astin, T. R. and Hewett, A. J. (2019) The Old Red Group (Devonian) – Rotliegend Group (Permian) unconformity in the Inner Moray Firth. Geological Society London Special Publications, 471 (1), 237-252. (doi:10.1144/SP471.12).

Record type: Article

Abstract

A major stratigraphical problem in the offshore Paleozoic of the Inner Moray Firth is the identification of the top of the Devonian Old Red Sandstone Group beneath the lithologically similar Permian Rotliegend Group. Wireline log criteria for a revised Old Red Group to Permian boundary are given for the Inner Moray Firth. Section lines drawn using these criteria and flattened on the overlying Triassic Smith Bank or Permian Kupferschiefer formations show a relatively thin development of Rotliegend with two depocentres. The underlying Devonian when flattened on the Eday Marl shows a systematic subcrop pattern. There is currently no exposed onshore Old Red to Rotliegend boundary, but the possibility remains that a Permian section is present in the ‘Upper Old Red Sandstone’ of Tarbat in Easter Ross. An exposed Permian–Devonian boundary is present in East Greenland and provides an analogue for the Inner Moray Firth.

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More information

e-pub ahead of print date: 22 June 2018
Published date: 1 January 2019

Identifiers

Local EPrints ID: 429315
URI: https://eprints.soton.ac.uk/id/eprint/429315
ISSN: 0305-8719
PURE UUID: 3b2b7808-a916-4674-801c-1af61fae18f2

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Date deposited: 26 Mar 2019 17:30
Last modified: 26 Mar 2019 17:30

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Contributors

Author: J. E. A. Marshall
Author: K. W. Glennie
Author: T. R. Astin
Author: A. J. Hewett

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