Cambridge Greensand

The Cambridge Greensand is a geological formation in England whose strata are earliest Cenomanian in age.[1] It lies above the erosive contact between the Gault Formation and the Chalk Group in the vicinity of Cambridgeshire, and technically forms the lowest member bed of the West Melbury Marly Chalk Formation.[2] It is a remanié deposit, containing reworked fossils of late Albian age, including those of dinosaurs and pterosaurs.

Not to be confused with Cambridge Formation.
Cambridge Greensand
Stratigraphic range: Earliest Cenomanian ~100 Ma
↓
TypeGeological Formation
UnderliesChalk Group
OverliesGault Formation
Thickness0.1–1 m (0.33–3.28 ft)
Lithology
PrimaryGlauconitic marl
OtherPhosphorite
Location
Coordinates52.2°N 0.1°E / 52.2; 0.1
Approximate paleocoordinates41.0°N 1.8°E / 41.0; 1.8
RegionEngland
Country UK
ExtentNorth Hertfordshire and Cambridgeshire
Type section
Named forCambridge
LocationArlesey Brickpit
Cambridge Greensand (England)

Description

The lithology is made out of glauconitic marl, described as a "chalk mud", containing abundant ostracod, coccolith and foram remains, with a concentration of phosphatic nodules and bones at the base.[1][2]

Vertebrate paleofauna

Birds

Ornithischians

Saurischians

Pterosaurs

Ichthyosaurs

Lepidosauria

Invertebrates

Ammonites
  • Salaziceras (Salaziceras) salazacense[13]

See also
  • List of dinosaur-bearing rock formations

References
  1. Hart, Malcolm B.; Fox, Lyndsey R. (2020). "Micropalaeontology and stratigraphical setting of the Cambridge Greensand". Geological Society, London, Special Publications. 498 (1): 147–163. doi:10.1144/SP498-2018-144. ISSN 0305-8719.
  2. Cambridge Greensand at BGS
  3. "Table 11.1," in Weishampel, et al. (2004). Page 215.
  4. "Table 17.1," in Weishampel, et al. (2004). Page 367.
  5. "Table 19.1," in Weishampel, et al. (2004). Page 417.
  6. "Table 20.1," in Weishampel, et al. (2004). Page 443.
  7. "Table 13.1," in Weishampel, et al. (2004). Page 270.
  8. Taissa Rodrigues & Alexander Wilhelm Armin Kellner (2013). "Taxonomic review of the Ornithocheirus complex (Pterosauria) from the Cretaceous of England". ZooKeys. 308: 1–112. doi:10.3897/zookeys.308.5559. PMC 3689139. PMID 23794925.
  9. Unwin D.M., 2001, "An overview of the pterosaur assemblage from the Cambridge Greensand (Cretaceous) of Eastern England", Mitteilungen aus dem Museum für Naturkunde in Berlin, Geowissenschaftliche Reihe 4: 189–221
  10. Averianov A.O. (2012). "Ornithostoma sedgwicki – valid taxon of azhdarchoid pterosaurs". Proceedings of the Zoological Institute RAS. 316 (1): 40–49.
  11. Valentin Fischer; Nathalie Bardet; Myette Guiomar & Pascal Godefroit (2014). "High Diversity in Cretaceous Ichthyosaurs from Europe Prior to Their Extinction". PLoS ONE. 9 (1): e84709. doi:10.1371/journal.pone.0084709. PMC 3897400. PMID 24465427.
  12. P. M. Barrett and S. E. Evans. 2002. A reassessment of the Early Cretaceous reptile 'Patricosaurus merocratus' Seeley from the Cambridge Greensand, Cambridgeshire, UK. Cretaceous Research 23:231-240
  13. C. W. Wright and W. J. Kennedy. 1979. Origin and evolution of the Cretaceous micromorph ammonite family Flickiidae. Palaeontology 22:685-704
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