Infracombe Slates: Combe Martin Slates (Jenny Start Limestone) Holwill Coll'n. (Devonian of the United Kingdom)

Where: England, United Kingdom (51.2° N, 4.0° W: paleocoordinates 25.8° S, 0.6° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Jenny Start Limestone Member (Combe Martin Slates Formation), Givetian (387.7 - 382.7 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; ooidal limestone and gray, silty, calcareous slate

• "Combe Martin Slates...mark a northward marine transgression and the establishment of a shelf sea over the whole of north Devon. Calm waters prevailed and coral banks grew..."
• "The Combe Martin Slates, comprising slates with three distinctive limestone beds, and subordinate thin sandstones and siltstones...The slates of the sequence are silvery grey, calcareous and commonly silty, the sandstones generally grey, fine grained and seldom thicker than 0.3 m...The Jenny Start Limestone commonly has an oolitic texture...The strata between the Jenny Start Lst and the Combe Martin Beach Lst comprise calcareous slates with thin limestone bands...sandy strata...and well-cleaved grey slates...The distinctive Combe Martin Beach Lst [is] highly ferruginous, with a considerable amount of pyrite, and associated with green calcareous shales...The David's Stone Limestone...comprises two beds separated by slates..."

Collection methods: Material from Holwill Collection (Murchison Museum, Imperial College London). Included here are only those species not present in the BGS collections.

Primary reference: E. A. Edmonds, A. Whittaker, and B. J. Williams. 1985. Geology of the country around Ilfracombe and Barnstaple (Memoirs of the British Geological Survey for 1:50000 sheets 277 and 293, new series) 1-97 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 38407: authorized by Michael Foote, entered by Michael Foote on 21.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Stauriida - Ptenophyllidae
Acanthophyllum sp. Dybowski 1873 horn coral
 Stauriida - Stringophyllidae
Stringophyllum sp. Wedekind 1922 horn coral
 Stauriida - Phillipsastreidae
Scruttonia sp. Cherepnina 1974 horn coral
 Stauriida - Lykophyllidae