Cambridge Greensand
{{confuse|Cambridge Formation}}
{{Infobox rockunit
| name = Cambridge Greensand
| image =
| caption =
| type = Member
| age = Earliest Cenomanian ~{{fossilrange|100}}
| period = Cenomanian
| prilithology = Glauconitic marl
| otherlithology = Phosphorite
| namedby =
| region = England
| country = {{flag|UK}}
| coordinates = {{coord|52.2|N|0.1|E|display=inline,title}}
| paleocoordinates = {{coord|41.0|N|1.8|E|display=inline}}
| unitof = West Melbury Marly Chalk Formation
| subunits =
| underlies = Chalk Group
| overlies = Gault Formation
| thickness = {{convert|0.1|-|1|m|ft|abbr=on}}
| extent = North Hertfordshire and Cambridgeshire
| area =
| map = {{Location map+ | England
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | England
| lat_deg = 52.2
| lon_deg = 0.1
| mark = Lightgreen pog.svg
| marksize = 12
}}
}}
| map_caption =
| namedfor = Cambridge
| location_ts = Arlesey Brickpit
}}
The Cambridge Greensand is a geological unit in England whose strata are earliest Cenomanian in age.{{Cite journal|last1=Hart|first1=Malcolm B.|last2=Fox|first2=Lyndsey R.|date=2020|title=Micropalaeontology and stratigraphical setting of the Cambridge Greensand|url=http://sp.lyellcollection.org/lookup/doi/10.1144/SP498-2018-144|journal=Geological Society, London, Special Publications|language=en|volume=498|issue=1|pages=147–163|doi=10.1144/SP498-2018-144|bibcode=2020GSLSP.498..147H|s2cid=210304478|issn=0305-8719}} 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.[http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=CBG Cambridge Greensand] at BGS It is a remanié deposit, containing reworked fossils of late Albian age, including those of dinosaurs and pterosaurs.
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.
Vertebrate paleofauna
= Birds =
| class="wikitable"
|+ ! colspan="6" |Birds |
| Genus
!Species !Locality !Material !Notes !Images |
|---|
| rowspan="3" |Enaliornis
|E. barrette | |Braincases, vertebrae, pelvis [and] limb elements"Table 11.1," in Weishampel, et al. (2004). Page 215. | rowspan="3" |This genus is the oldest known hesperornithine | |
| E sedgwicki
| | |
| E. seeleyi
| |Assorted cranial and postcranial elements | |
= Dinosaurs =
== Ornithischians ==
{{Paleobiota-key-compact}}
| class="wikitable"
! colspan="6" |Ornithischians |
| Genus
!Species !Locality !Material !Notes !Images |
|---|
| rowspan="2" |Anoplosaurus
|A. curtonotus | |"Partial postcranium""Table 17.1," in Weishampel, et al. (2004). Page 367. | | |
| A. major
| |"Cervical vertebrae." "Vertebrae.""Table 19.1," in Weishampel, et al. (2004). Page 417. | | |
| rowspan="4" |Acanthopholis
|style="background:#E6E6E6;"| A. eucercus |style="background:#E6E6E6;"| |style="background:#E6E6E6;"| "[Two] caudal centra." |style="background:#E6E6E6;"| Nomen dubium |style="background:#E6E6E6;"| |
| style="background:#E6E6E6;"| A. platypus
|style="background:#E6E6E6;"| |style="background:#E6E6E6;"| "Phalanx, caudal centra." |style="background:#E6E6E6;"| Nomen dubium |style="background:#E6E6E6;"| |
| style="background:#fbdddb;" |A. macrocercus
|style="background:#fbdddb;" | |style="background:#fbdddb;" |"Osteoderms." "Vertebrae, fragmentary skeleton elements." |style="background:#fbdddb;" |Reassigned to Syngonosaurus |style="background:#fbdddb;" | |
| style="background:#E6E6E6;"| A. stereocercus
|style="background:#E6E6E6;"| |style="background:#E6E6E6;"| "Osteoderms." "Vertebrae." |style="background:#E6E6E6;"| Nomen dubium |style="background:#E6E6E6;"| |
| Eucercosaurus
|E. tanyspondylus | | | |
| style="background:#E6E6E6;"| Trachodon
|style="background:#E6E6E6;"| T. cantabrigiensis |style="background:#E6E6E6;"| |style="background:#E6E6E6;"| "Dentary tooth.""Table 20.1," in Weishampel, et al. (2004). Page 443. |style="background:#E6E6E6;"| Nomen dubium |style="background:#E6E6E6;"| |
== Saurischians ==
| class="wikitable"
! colspan="6" |Saurischians |
| Genus
!Species !Locality !Material !Notes !Images |
|---|
| Macrurosaurus
|M. semnus | |"Caudal vertebrae""Table 13.1," in Weishampel, et al. (2004). Page 270. |Titanosauriform sauropod or indeterminate macronarian | |
= Pterosaurs =
{{Paleobiota-key-compact}}
= Ichthyosaurs =
| class="wikitable"
! colspan="6" |Ichthyosaurs |
| Genus
!Species !Locality !Material !Notes !Images |
|---|
| Cetarthrosaurus
| | | | |
| Maiaspondylus
|M. cantabrigiensis | | | | |
| Pervushovisaurus
|P. campylodon | | | | |
| Sisteronia
|S. seeleyi | | | | |
= Lepidosauria =
{{Paleobiota-key-compact}}
| class="wikitable"
! colspan="6" |Lepidosauria |
| Genus
!Species !Locality !Material !Notes !Images |
|---|
| style="background:#E6E6E6;"| Patricosaurus
|style="background:#E6E6E6;"| P. merocratusP. 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 |style="background:#E6E6E6;"| |style="background:#E6E6E6;"| |style="background:#E6E6E6;"| Chimeric specimen |style="background:#E6E6E6;"| |