Dbk: Created page with "'''Base''': The base of the subzone is immediately below the first appearance of the ammonite ''Turrilites acutus'' (Robaszynski ''et al''., 1998), although previously it has ..."

2013-09-26T11:51:20Z

Created page with "'''Base''': The base of the subzone is immediately below the first appearance of the ammonite ''Turrilites acutus'' (Robaszynski ''et al''., 1998), although previously it has ..."

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'''Base''': The base of the subzone is immediately below the first appearance of the ammonite ''Turrilites acutus'' (Robaszynski ''et al''., 1998), although previously it has been placed somewhat lower, at the top of the highest of three widely developed Cenomanian acmes of the brachiopod ''Orbirhynchia mantelliana'' (Bristow ''et al''., 1995).

'''Top''': The top of the subzone is immediately below the first appearance of the ammonite ''Acanthoceras jukesbrownei'' (Robaszynski ''et al''., 1998)

'''Range of index species''': The index species occurs in the lower half of the subzone only (Robaszynski ''et al''., 1998).

'''Key fauna''':
{| class="Wikitable"
| Brachiopoda: || ''Concinnithyris subundata''
|-
| Bivalvia: || ''Inoceramus atlanticus''
|-
| Ammonoidea: ||''Acanthoceras rhotomagense''
|-
| ||''Turrilites acutus''
|}
'''Faunal abundance & preservation''': The subzone is rather sparsely fossiliferous, except for locally common terebratulid brachiopods.Ammonites are rather poorly preserved as iron-stained chalky moulds.

'''Bio-markers''': ''Inoceramus atlanticus'' is common in the higher part of the subzone.

'''Age''': Mid Cenomanian

[[category:Standard zonation | 009]]

Turrilites acutus Subzone - Revision history

Dbk: Created page with "'''Base''': The base of the subzone is immediately below the first appearance of the ammonite ''Turrilites acutus'' (Robaszynski ''et al''., 1998), although previously it has ..."