Infracombe Slates: Combe Martin Slates (David's Stone Lst.) Holwill Coll'n.: Givetian, United Kingdom

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Stromatoporoidea - Stromatoporoidea
Stromatoporoidea indet. Nicholson and Murie 1878
Demospongiae - Hadromerida - Suberitidae
Chaetetes multitabulatus
Anthozoa - Stauriida - Phillipsastreidae
cf. Phillipsastraea cf. devoniensis
synonym of Phillipsastrea
Anthozoa - Favositida - Alveolitidae
? Alveolites spp.
Anthozoa - Favositida - Favositidae
Pachyfavosites polymorphus
Anthozoa - Favositida - Pachyporidae
Thamnopora tumefacta
Anthozoa - Auloporida - Auloporidae
Aulopora sp. Goldfuss 1829
see common names

Geography
Country:United Kingdom State/province:England
Coordinates: 51.2° North, 4.0° West (view map)
Paleocoordinates:25.8° South, 0.6° East
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Devonian Epoch:Middle Devonian
Stage:Givetian 10 m.y. bin:Devonian 3
Key time interval:Givetian
Age range of interval:387.70000 - 382.70000 m.y. ago
Stratigraphy
Geological group:Infracombe Slates Formation:Combe Martin Slates Member:David's Stone Limestone
Stratigraphic resolution:member
Lithology and environment
Primary lithology: "limestone"
Secondary lithology:gray silty,calcareous slate
Includes fossils?Y
Lithology description: "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..."
Environment:marine indet.
Geology comments: "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..."
Taphonomy
Collection methods and comments
Collection excludes:some genera
Reason for describing collection:biostratigraphic analysis
Collection method comments: Material from Holwill Collection (Murchison Museum, Imperial College London). Included here are only those species not present in the BGS collections.
Metadata
Database number:38418
Authorizer:M. Foote Enterer:M. Foote
Modifier:J. Alroy Research group:marine invertebrate
Created:2004-04-21 11:54:42 Last modified:2007-02-21 11:35:56
Access level:the public Released:2004-04-21 11:54:42
Creative Commons license:CC BY
Reference information

Primary reference:
10303. 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]