Infracombe Slates: Combe Martin Slates (Jenny Start Limestone) Site G (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

• outcrop-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..."

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 38405: authorized by Michael Foote, entered by Michael Foote on 21.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Blastozoa indet.
Blastozoa indet. Sprinkle 1973
"cystoidean"
Rhynchonellata
 Orthida - Schizophoriidae
Schizophoria sp.
Schizophoria sp. King 1850
Anthozoa
 Stauriida - Phillipsastreidae
Thamnophyllum caespitosum
 Stauriida - Disphyllidae
Disphyllum aequiseptatum, cf. Disphyllum cf. goldfussi
 Favositida - Pachyporidae
Thamnopora cervicornis, Thamnopora cronigera, Thamnopora polyforata, Thamnopora cf. tumefacta, Thamnopora spp.
Thamnopora cervicornis tabulate coral
Thamnopora cronigera tabulate coral
Thamnopora polyforata tabulate coral
Thamnopora cf. tumefacta tabulate coral
Thamnopora spp. Steininger 1831 tabulate coral
 Favositida - Alveolitidae
Alveolites spp., Alveolites suborbicularis
Alveolites spp. Lamarck 1801 tabulate coral
Alveolites suborbicularis Lamarck 1801 tabulate coral
 Favositida - Coenitidae
Coenites escharoides
Coenites escharoides tabulate coral
 Auloporida - Aulocystidae
? Aulocystis sp.
? Aulocystis sp. Schlüter 1885 tabulate coral