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GEOREF RECORD

Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England

Chloe E. A. Amberg, Thijs R. A. Vandenbroucke, Stewart G. Molyneux and Thomas Servais
Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England (in Special issue in honor of Gordon D. Wood, Merrell A. Miller (editor), Thomas Servais (editor) and Reed Wicander (editor))
Palynology (November 2017) 41 (SUPPL.): 23-30

Abstract

The Global Stratotype Section and Point (GSSP) for the Lower Ordovician Floian Stage is defined by the first appearance datum (FAD) of the graptolite Tetragraptus approximatus at Diabasbrottet Quarry, Hunneberg, southern Sweden. Correlation of sections with the Floian GSSP when graptolites are absent, however, must rely on other criteria. Among other fossil groups with potential for biostratigraphical correlation at this level are chitinozoans. Here we describe a chitinozoan assemblage from the Watch Hill Formation in the Skiddaw Group of northern England. The Watch Hill Formation is dated on graptolite evidence as late Tremadocian, but the assemblage contains Euconochitina symmetrica, a species previously considered to indicate the eponymous lowermost Arenig (Floian) chitinozoan biozone in a long-established Gondwanan Ordovician biozonal scheme. The hitherto earliest Floian index species has also been reported recently from Tremadocian successions in South China and Morocco. We here confirm its extended range into the Tremadocian and its continued significance as an index species for the Tremadocian-Floian boundary interval.


ISSN: 0191-6122
EISSN: 1558-9188
Serial Title: Palynology
Serial Volume: 41
Serial Issue: SUPPL.
Title: Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England
Title: Special issue in honor of Gordon D. Wood
Author(s): Amberg, Chloe E. A.Vandenbroucke, Thijs R. A.Molyneux, Stewart G.Servais, Thomas
Author(s): Miller, Merrell A.editor
Author(s): Servais, Thomaseditor
Author(s): Wicander, Reededitor
Affiliation: Universite de Lille, Unite Evolution, Ecologie et Paleontologie, Lille, France
Affiliation: IRF Group, Tulsa, OK, United States
Pages: 23-30
Published: 201711
Text Language: English
Publisher: American Association of Stratigraphic Palynologists, Dallas, TX, United States
References: 39
Accession Number: 2018-039818
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., geol. sketch map
N54°40'00" - N54°40'00", W03°22'00" - W03°22'00"
Secondary Affiliation: British Geological Survey, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, American Association of Stratigraphic Palynologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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