Dbk: Created page with "This zone is only currently used in northern England (Whitham, 1991), and in some areas has in part been replaced by the standard ammonite zonal equivalents (= ''M. geslinianu..."

2013-09-26T14:04:45Z

Created page with "This zone is only currently used in northern England (Whitham, 1991), and in some areas has in part been replaced by the standard ammonite zonal equivalents (= ''M. geslinianu..."

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This zone is only currently used in northern England (Whitham, 1991), and in some areas has in part been replaced by the standard ammonite zonal equivalents (= ''M. geslinianum'' & ''N. juddii'' zones) for this part of the Cenomanian (Gaunt ''et al''., 1992).

'''Base''': The base of the zone is the sub-Black Band (s.l.) erosion surface (Whitham, 1991).

'''Top''': The top of the zone is placed at an un-named chalky marl, locally c. 0.5 m below the lowest acme of the inoceramid bivalve ''Mytiloides'' (Whitham, 1991).

'''Range of index species''': The index was not recorded by Whitham (1991)

'''Key fauna''':
{| class="Wikitable"
| Brachiopoda: || ''Monticlarella jefferiesi''
|-
| ||''Orbirhynchia multicostata ''
|-
| ||''O. wiesti''
|-
| Bivalvia: || ''Inoceramus pictus''
|-
| ||''Oxytoma seminudum''
|-
| Belemnoidea:|| ''Praeactinocamax plenus''
|-
| Vertebrata: || fish debris
|}
'''Faunal abundance & preservation''': The zone is rather poorly fossiliferous, and the fauna of low diversity.

'''Bio-horizons''': ''Praeactinocamax plenus'' occurs at two closely spaced horizons below the Black Band s.s., in the lower part of the zone (Wood & Mortimore, 1995).

'''Age''': Late Cenomanian

[[category:Standard zonation | 034]]

Sciponoceras gracile Zone - Revision history

Dbk: Created page with "This zone is only currently used in northern England (Whitham, 1991), and in some areas has in part been replaced by the standard ammonite zonal equivalents (= ''M. geslinianu..."