Double Arches [Shenley Limestone] (Cretaceous of the United Kingdom)

Where: England, United Kingdom (51.9° N, 0.7° W: paleocoordinates 40.5° N, 6.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Leymeriella regularis ammonoid zone, Shenley Limestone Formation, Early/Lower Albian (112.0 - 109.0 Ma)

• STRATIGRAPHIC RELATIONS: The Shenley Limestone is found at the contact between the clastic Lower Greensand and Gault Clay formations. AGE: Early Albian; Leymeriella regularis Subzone. STRATIGRAPHIC POSITION:

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, glauconitic, pebbly, sandy wackestone

• SPECIFIC LITHOLOGY: Wackestone with 10–30% quartz sand and occasional clasts of ironstone and glauconitized limestone pebbles. LITHIFICATION: Not explicitly stated, but probably lithified.

Size class: macrofossils

Preservation: original calcite

Collected by Gale, Jarvis in 1974; reposited in the BMNH

Collection methods: bulk, surface (float),

• COLLECTOR: A. Gale, J. Jarvis, 1974. REPOSITORY: British Museum of Natural History (BMNH).

Primary reference: H. Hess and A. S. Gale. 2010. Crinoids from the Shenley Limestone (Albian) of Leighton Buzzard, Bedfordshire, UK. Journal of Systematic Palaeontology 8(3):427-447 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 161933: authorized by Austin Hendy, entered by Austin Hendy on 16.09.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to crinoids, but other macroinvertebrate groups said to be present. NOMENCLATURE: Authoritative publication, with modern nomenclature, and species-resolution identifications.
 Isocrinida - Isocrinidae
Isocrinus legeri Repelin 1899 Sea lily
Balanocrinus smithi n. sp. Hess and Gale 2010 Sea lily
 Cladida - Cyclocrinidae
Cyclocrinus variolarius Seeley 1866 Sea lily
 Cyrtocrinida - Sclerocrinidae
Torynocrinus canon Seeley 1866 Sea lily
Torynocrinus globosus n. sp. Hess and Gale 2010 Sea lily
 Roveacrinida - Roveacrinidae
"Discocrinus integer n. sp." = Calvaticrinus integer
"Discocrinus integer n. sp." = Calvaticrinus integer Hess and Gale 2010 Sea lily
 Millericrinida - Apiocrinitidae
Apiocrinites gillieroni de Loriol 1877 Sea lily