Middle Ordovician (Darriwilian) radiolarians from the Crawford Group, Scotland

A diverse assemblage of moderately well-preserved radiolarians occurs in the Ordovician cherts of the Crawford Group in the Southern Uplands terrane of the Scottish borders. A total of 8 genera and 11 species are described. Taxa present correlate to the Middle Ordovician Pygodus anserinus biozone. K...

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Published in:Geological magazine 2020-12, Vol.157 (12), p.2033-2043
Main Authors: Perera, Siyumini, Aitchison, Jonathan C., Nothdurft, Linda
Format: Article
Language:English
Subjects:
assemblages
biostratigraphy
chemically precipitated rocks
chert
Cherts
Computed tomography
Crawford Group
Darriwilian
Dominant species
Europe
Genera
Great Britain
Introduced species
invertebrate
microfossils
Middle Ordovician
New species
Ordovician
Original Article
Paleontology
Paleozoic
Periodon aculeatus
Pygodus anserinus
Radiolaria
Scanning electron microscopy
Scotland
sedimentary rocks
Southern Uplands
Stratigraphy
Taxonomy
Tomography
United Kingdom
Western Europe
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description A diverse assemblage of moderately well-preserved radiolarians occurs in the Ordovician cherts of the Crawford Group in the Southern Uplands terrane of the Scottish borders. A total of 8 genera and 11 species are described. Taxa present correlate to the Middle Ordovician Pygodus anserinus biozone. Key species identified include: Proventocitum procerulum, Inanigutta gansuensis, Inanigutta sp. cf. I. complanata, Inanibigutta sp. cf. I. verrucula, Inanibigutta sp. cf. I. pinglianensis, ?Inanibigutta inconstans, ?Inanihella penrosei, Haplentactinia armillata, ?Oriundogutta ramificans and Syntagentactinia sp. A new species Haplotaeniatum albaensis is introduced here and described on the basis of details of skeletal architecture observed using microcomputed tomography, demonstrating the potential of this technique as a tool for improving the understanding of radiolarian taxonomy.
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source Cambridge Journals Online
subjects assemblages
biostratigraphy
chemically precipitated rocks
chert
Cherts
Computed tomography
Crawford Group
Darriwilian
Dominant species
Europe
Genera
Great Britain
Introduced species
invertebrate
microfossils
Middle Ordovician
New species
Ordovician
Original Article
Paleontology
Paleozoic
Periodon aculeatus
Pygodus anserinus
Radiolaria
Scanning electron microscopy
Scotland
sedimentary rocks
Southern Uplands
Stratigraphy
Taxonomy
Tomography
United Kingdom
Western Europe
title Middle Ordovician (Darriwilian) radiolarians from the Crawford Group, Scotland
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