Horizon B, Blackborough, Devon [Blackdown Greensand]: Late/Upper Albian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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? Resabulum rusticum
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p category | |||||||||
| juvenile | ||||||||||
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Cephalopoda
- Ammonitida
- Brancoceratidae
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Hysteroceras varicosum
(Sowerby 1824)
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p category | |||||||||
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Gastropoda
- Ampullariidae
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Pictavia rotundata
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p category | |||||||||
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Gastropoda
- Turritellidae
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Turritella (Torquesia) granulata
(Sowerby 1827)
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p category | |||||||||
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Gastropoda
- Neogastropoda
- Muricidae
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"Murex" calcar
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p category | |||||||||
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Gastropoda
- Aporrhaidae
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Drepanocheilus calcarata
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c category | |||||||||
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Drepanocheilus neglecta
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p category | |||||||||
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Bivalvia
- Nuculida
- Nuculidae
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Nucula (Leionucula) impressa
Conrad 1849
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p category | |||||||||
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Bivalvia
- Poromyida
- Poromyidae
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? Liopistha (Psilomya) gigantea
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p category | |||||||||
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Bivalvia
- Pholadida
- Corbulidae
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Corbula truncata
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p category | |||||||||
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Bivalvia
- Pholadida
- Pleuromyidae
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"Pleuromya" laeviscula
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p category | |||||||||
| original and current combination Myacites (Pleuromya) | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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? Callistina plana
(Sowerby 1813)
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p category | |||||||||
| recombined as Aphrodina plana | ||||||||||
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Bivalvia
- Cardiida
- Mactridae
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Geltena angulata
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p category | |||||||||
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Bivalvia
- Cardiida
- Cardiidae
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Protocardia hillana
(Sowerby 1813)
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p category | |||||||||
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Bivalvia
- Lucinida
- Lucinidae
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? Mutiella ? canaliculata
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p category | |||||||||
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Bivalvia
- Lucinida
- Mactromyidae
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Thetis laevigatum
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p category | |||||||||
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Bivalvia
- Carditida
- Astartidae
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Nicaniella formosa
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p category | |||||||||
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Bivalvia
- Trigoniida
- Megatrigoniidae
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? Pterotrigonia scabricola
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p category | |||||||||
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Bivalvia
- Myalinida
- Inoceramidae
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Birostrina concentrica
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p category | |||||||||
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Bivalvia
- Ostreida
- Pinnidae
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Pinna sp.
Linnaeus 1758
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p category | |||||||||
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Bivalvia
- Ostreida
- Gryphaeidae
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Amphidonte obliquatum
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vc category | |||||||||
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Bivalvia
- Arcida
- Parallelodontidae
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Nanonavis carinata
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p category | |||||||||
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Bivalvia
- Arcida
- Cucullaeidae
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Cucullaea (Idonearca) glabra
Parkinson 1811
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p category | |||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | England |
| Coordinates: | 50.9° North, 3.3° West (view map) | ||
| Paleocoordinates: | 39.2° North, 0.1° East | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Albian | 10 m.y. bin: | Cretaceous 4 |
| Key time interval: | Late/Upper Albian | Ammonoid zone: | Hysteroceras varicosum |
| Age range of interval: | 106.20000 - 100.50000 m.y. ago |
Stratigraphy
| Formation: | Blackdown Greensand | ||||
| Local section: | Blackborough | Local bed: | 2.26 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Horizon B - 2.26 m above the base of the section. Belongs to H. varicosum zone. (upper Albian). This is possibly equivalent top Downes (1882) Bed 7. The total section thickness was 7 m. Blackdown Greensand is an informal unit, describing a 30 m+ Cretaceous sequence of decalcified sands with layers of cherty sandstone concretions. The Greensand unconformably overlies Triassic and Jurassic strata.. | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal poorly lithified sandstone |
| Includes fossils? | Y |
| Lithology description: Shelly sandstone. | |
| Environment: | coastal indet. |
| Geology comments: Shallow marine sandbar complex, influenced by weak tides and periodic storms. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: No repository mentioned, but presumably this is the British Geological Survey. | |
| Taxonomic list comments:Exhaustive for Mollusca. Nomenclature appears to be fair. Key top abundance: p=present, c=common, vc=very common | |
Metadata
| Database number: | 51673 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2005-06-09 11:28:42 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2005-06-09 11:28:42 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 13726. | 1% 2880 | M. A. Woods and N.S. Jones. 1996. The sedimentology and biostratigraphy of a temporary exposure of Blackdown Greensand (Lower Cretaceous, upper Albian) at Blackborough, Devon. Proceedings of the Ussher Society 9(1):37-40 [A. Miller/A. Hendy/A. Hendy] |
Secondary references:
| 29264 | H. L. Abbass. 1962. The english Cretaceous Turritellide and Mathildidae (Gastropoda). Bulletin of the British Museum (Natural History), Geology 7(6):175-196 [A. Hendy/A. Hendy] |