Dbk: Created page with "'''Base''': The base of the ''M. saxbii'' Subzone is recognised by the appearance of common compressed ammonites of the ''M. saxbii'' group. '''Top''': The top of the subzone..."

2013-09-26T10:31:00Z

Created page with "'''Base''': The base of the ''M. saxbii'' Subzone is recognised by the appearance of common compressed ammonites of the ''M. saxbii'' group. '''Top''': The top of the subzone..."

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'''Base''': The base of the ''M. saxbii'' Subzone is recognised by the appearance of common compressed ammonites of the ''M. saxbii'' group.

'''Top''': The top of the subzone is immediately below the first appearance of ''M. dixoni''.

'''Range of index species''': Inflated forms of the index species first occur in the ''S. schlueteri'' Subzone. The index is abundant in the nominate subzone where inflated forms are scarce, and it occurs rarely in the overlying ''M. dixoni'' Zone (Wright & Kennedy, 1984).

'''Key Fauna''':

{| class="Wikitable"
| Ammonoidea: ||''Hyphoplites falcatus''
|-
| ||''Mantelliceras saxbii'' (common)
|}

Heteromorph ammonites like ''Anisoceras'' and ''Idiohamites'' are absent (Kennedy, 1969).

'''Faunal abundance and preservation''': The fauna is sometimes phosphatised, due to an erosion event at the junction of the ''M. mantelli'' and ''M. dixoni'' zones (Gale, 1995).

'''Bio-markers''': None

'''Age''': Early Cenomanian

[[category:Standard zonation | 004]]

Mantelliceras saxbii Subzone - Revision history

Dbk: Created page with "'''Base''': The base of the ''M. saxbii'' Subzone is recognised by the appearance of common compressed ammonites of the ''M. saxbii'' group. '''Top''': The top of the subzone..."