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GEOREF RECORD

Demarcation of the boundary between Middle Devonian upper Stromness Flagstone and Rousay Flagstone formations in Westray, Orkney

David Leather
Demarcation of the boundary between Middle Devonian upper Stromness Flagstone and Rousay Flagstone formations in Westray, Orkney
Scottish Journal of Geology (November 2017) 53 (2): 53-61

Abstract

The only official maps to show a boundary between the Middle Devonian Stromness and Rousay Flagstones on Orkney are those published by the Geological Survey in 1932 and 1935. Since then, the difficulties of defining and locating this boundary have challenged many workers in the Orcadian Lake Basin. In 2015, the introduction of biozones by Uisdean Michie, based on fossil fish, and the recent discovery in Westray of the zone fossils Osteolepis panderi and Thursius pholidotus in a prominent fish bed across the island, has permitted the boundary for the base of the Rousay Formation to be determined in that part of Orkney. It is suggested that other characteristics of the fish bed of this rhythmic cycle of sediments, together with those in adjacent cycles, may be used as a marker for further correlation and mapping across the basin.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 53
Serial Issue: 2
Title: Demarcation of the boundary between Middle Devonian upper Stromness Flagstone and Rousay Flagstone formations in Westray, Orkney
Author(s): Leather, David
Affiliation: Woodlands, Panorama Drive, Ilkley, West Yorkshire, United Kingdom
Pages: 53-61
Published: 201711
Text Language: English
Publisher: Geological Society Publishing House for the Geological Societies of Edinburgh and Glasgow, Bath, United Kingdom
References: 23
Accession Number: 2018-018735
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., sects., 1 table, geol. sketch maps
N59°17'60" - N59°17'60", W03°00'00" - W03°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 2018
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