Mantelliceras mantelli Zone: Difference between revisions
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| ||''I. crippsi'' (locally abundant) | | ||''I. crippsi'' (locally abundant) | ||
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| Ammonoidea: ''Hyphoplites'' spp. | | Ammonoidea:||''Hyphoplites'' spp. | ||
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| ||''Hypoturrilites gravesianus'' | | ||''Hypoturrilites gravesianus'' | ||
Revision as of 15:28, 25 September 2013
Base: Base of the zone is mostly coincident with the base of the Chalk Group, except where earliest Cenomanian deposits comprise glauconitic sandstones (eg. locally in South-east Devon), where it is within the highest part of the Upper Greensand Formation.
Top: The top of the zone is immediately below the first appearance of Mantelliceras dixoni (Gale, 1995).
Range of Index species: Common in nominate zone, rare in overlying M. dixoni Zone (Wright & Kennedy, 1984).
Key Fauna:
| Porifera: | Stauronema carteri |
| Brachiopoda: | Tropeothyris? carteri |
| Bivalvia: | Aucellina spp. |
| Inoceramus anglicus | |
| I. crippsi (locally abundant) | |
| Ammonoidea: | Hyphoplites spp. |
| Hypoturrilites gravesianus | |
| Mantelliceras spp. (except M. dixoni) | |
| Mariella spp. | |
| Neostlingoceras carcitanense | |
| Schloenbachia spp. (locally abundant) | |
| Sharpeiceras spp. |
Faunal abundance & preservation: Typically rich and phosphatised fauna near base of zone.
Bio-markers: (see under subzones)
Subzones: Mantelliceras saxbii
Sharpeiceras schlueteri
Neostlingoceras carcitanense
Age: Early Cenomanian
> faunal summary of M. mantelli Zone
> standard macrofossil zonation and correlation of the UK Chalk Group
> back