Bed D2D, Speeton: Early/Lower Hauterivian, United Kingdom
collected by C.J. Underwood, D. Ward

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Ophthalmosauridae
Acamptonectes densus n. gen., n. sp. Fischer et al. 2012
Fischer et al. 2012
GLAHM 132588 - holotype (a partial adult skeleton, including fragmentary skull roof, mandible, axial skeleton and scapular girdle)
Actinopteri
Teleostei indet. Müller 1846
teleost indet. (teeth, dentary)
Chondrichthyes - Orectolobiformes - Orectolobidae
Cretorectolobus doylei n. sp. Underwood et al. 1999
common category
more than 30 teeth from five beds
Chondrichthyes - Synechodontiformes - Palaeospinacidae
Synechodus dubrisiensis (Mackie 1863)
abundant category
more than 200 teeth from 5 beds (most from bed C7H)
Crinoidea
Crinoidea indet. Miller 1821
Fischer et al. 2012
see common names

Geography
Country:United Kingdom State/province:England County:North Yorkshire
Coordinates: 54.2° North, 0.2° West (view map)
Paleocoordinates:44.7° North, 9.8° East
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Hauterivian 10 m.y. bin:Cretaceous 2
Key time interval:Early/Lower Hauterivian Ammonoid zone: Endemoceras amblygonium
Age range of interval:132.60000 - 125.77000 m.y. ago
Stratigraphy
Formation:Speeton Clay
Stratigraphic resolution:bed
Stratigraphy comments: amblygonium Zone
Lithology and environment
Primary lithology:bioturbation,nodular,phosphatic poorly lithified claystone
Lithology description: The Speeton Clay Fm. consists of a condensed succession, about 130m thick, spanning much of the Lower Cretaceous from the Upper Berriasian to Middle Albian. The sediments are dominantly bioturbated open marine clays, some levels being rich in diagenetic carbonate and phosphate concretions and many units being rich in glauconite. There are a number of distinct horizons of hiatal condensation and erosion at which phosphatic fish material is concentrated.
Environment:offshore
Taphonomy
Modes of preservation:body,original phosphate
Size of fossils:macrofossils
Collection methods and comments
Collection methods:bulk,mechanical,sieve,field collection
Reason for describing collection:taxonomic analysis
Collectors:C.J. Underwood, D. Ward
Collection method comments: Repository: Liverpool Museum, National Museums and Galleries on Merseyside (LIVCM). Bulk samples of clay, 30–70 kg in dry weight, were sieved for fish material using a 125 mm or 250 mm mesh. The residues were picked for fish remains at size fractions down to 355 mm where possible, but coarse glauconite in some samples meant that picking size fractions below 500 mm was impractical.
Metadata
Database number:66422
Authorizer:M. Aberhan, P. Mannion Enterer:S. Nurnberg, P. Mannion
Modifier:M. Clapham Research group:marine invertebrate,vertebrate
Created:2006-10-09 06:37:00 Last modified:2020-09-05 22:27:16
Access level:the public Released:2006-10-09 06:37:00
Creative Commons license:CC BY
Reference information

Primary reference:
18982. C. J. Underwood, S. F. Michell, and K. J. Veltkamp. 1999. Shark and Ray teeth from the Hauterivian (Lower Cretaceous) of north-east England. Palaeontology 42(2):287-302 [M. Aberhan/S. Nurnberg/S. Nurnberg]

Secondary references:

39106 V. Fischer, M. W. Maisch, D. Naish, R. Kosma, J. Liston, U. Joger, F. J. Krüger, J. Pardo Pérez, J. Tainsh and R. M. Appleby. 2012. New ophthalmosaurid ichthyosaurs from the European Lower Cretaceous demonstrate extensive ichthyosaur survival across the Jurassic–Cretaceous boundary. PLoS One 7(1):e29234 [P. Mannion/P. Mannion]