mutabilis zone
United Kingdom and Ireland UK
Geological Time: Jurassic Upper Jurassic Kimmeridgian
Kimmeridge Clay Formation
the image is published in the source mentioned below
View of a specimen of Ammobaculites sp. ---
The identification is based upon:
, : Lloyd, A.J. (1959) Arenaceous Foraminifera from the Type Kimmeridgian (Upper Jurassic). Paleontology, 1(4), 298–320. Plate , Fig.
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