Neostlingoceras carcitanense Subzone: Difference between revisions
No edit summary |
No edit summary |
||
| Line 4: | Line 4: | ||
'''Range of index species''': Occurs in nominate subzone, and rare or absent in ''S. schlueteri'' Subzone (Gale & Friedrich, 1989). | '''Range of index species''': Occurs in nominate subzone, and rare or absent in ''S. schlueteri'' Subzone (Gale & Friedrich, 1989). | ||
'''Key Fauna''': | '''Key Fauna''': | ||
Porifera: ''Stauronema carteri'' | Porifera: ''Stauronema carteri'' | ||
Revision as of 15:34, 25 September 2013
Base: The base of the subzone is the base of the M. mantelli Zone.
Top: The top of the zone occurs in the interval immediately below the occurrence of common specimens of the ammonite Sharpeiceras spp. (Gale & Friedrich, 1989; Gale, 1995). Range of index species: Occurs in nominate subzone, and rare or absent in S. schlueteri Subzone (Gale & Friedrich, 1989).
Key Fauna:
Porifera: Stauronema carteri
Brachiopoda: Tropeothyris? carteri
Bivalvia: Aucellina spp. (locally common)
Inoceramus anglicus
Ammonoidea: Anisoceras spp.
Idiohamites spp.
Mantelliceras mantelli
Neostlingoceras carcitanense
Sciponoceras spp.
The occurrence of heteromorph ammonites (eg. Anisoceras spp., Idiohamites spp., Neostlingoceras spp. & Sciponoceras spp.) and the bivalve Aucellina is particulary characteristic of the N. carcitanense Subzone.
Faunal abundance & preservation: Typically a low diversity, phosphatised fauna. Bio-Markers: The bivalve Aucellina is common.
Age: Earliest Cenomanian