Affiliation:
1. StrataSolve Ltd, 15 Francis Road, Stockton Heath, Warrington WA4 6EB, UK
2. 22 Holtermann Street, Crows Nest, Sydney, NSW 2065, Australia
Abstract
Five Lower Albian (Lower Cretaceous) areoligeracean dinoflagellate cyst species are present in the Carstone Formation at Middlegate Quarry, North Lincolnshire, UK:
Canninginopsis monile
,
Circulodinium deflandrei
,
Cyclonephelium compactum
,
Cyclonephelium intonsum
and
Cyclonephelium longispinatum
. The taxonomy of
Circulodinium deflandrei
is reviewed with respect to 20 measured Carstone specimens. The taxonomy of
Cyclonephelium longispinatum
is reviewed with respect to 70 measured Carstone specimens and a study of 40 measured specimens from its type material in Site 361, Deep Sea Drilling Project Leg 40, offshore southwestern Africa.
Circulodinium deflandrei
and
Cyclonephelium longispinatum
have recently been considered by other workers to be junior synonyms, respectively, of
Circulodinium hirtellum
and
Tenua anaphrissa
. However, following detailed study of their morphologies, the synonymies are formally rejected here. An emended diagnosis is given for
C. longispinatum
. A re-assessment of the stratigraphical ranges of taxa co-occurring with the type material of
C. longispinatum
is consistent with a Late Albian to Early Turonian age range in Site 361.
Publisher
Geological Society of London
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