Dbk: Created page with "The subzone is only developed in southern England. In Northern Ireland, a non-sequence is thought to omit this horizon (Wilson & Manning, 1978). '''Base''': In southern Engla..."

2013-09-26T13:09:01Z

Created page with "The subzone is only developed in southern England. In Northern Ireland, a non-sequence is thought to omit this horizon (Wilson & Manning, 1978). '''Base''': In southern Engla..."

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The subzone is only developed in southern England. In Northern Ireland, a non-sequence is thought to omit this horizon (Wilson & Manning, 1978).

'''Base''': In southern England, the base of the subzone is placed at a thin marl c. 1 m beneath the Old Nore Marl (Young & Lake, 1988).

'''Top''': In southern England, the top of the subzone is placed at Telscombe Marl 4.

'''Range of index species''': The index is the same as for the parent zone, except that it is characteristically much more common, being concentrated into two acmes, one at the base of the subzone and another at the top. The index ranges above the nominate subzone, but is much rarer.

'''Key fauna''':
{| class="Wikitable"
| Brachiopoda: || ''Cretirhynchia exsculpta''
|-
| ||''Terebratulina rowei''
|-
| Echinoidea: || ''Echinocorys cincta''
|-
| ||'' E. truncata''
|-
| || '' Offaster pilula''
|-
| ||'' O. pilula planata''
|}
'''Bio-markers''': An acme of ''Offaster pilula'' at the base of the subzone coincides with an acme of ''Terebratulina rowei'' and ''Echinocorys truncata'' (Mortimore, 1986; Young & Lake, 1988). In the centre of the subzone ''Echinocorys cincta'' is predominant and ''Offaster'' ''pilula'' scarce or absent, followed by a return to abundant ''O. pilula'' in the top of the subzone, accompanied by the giant subspecies ''O. pilula planata'' (Mortimore, 1986; Young & Lake, 1988). Brydone (1939) named the acme of giant ''O. pilula'' at the top of the subzone the 'Planoconvexus Bed'.

'''Age''': Campanian

[[category:Standard zonation | 024]]

Subzone of abundant Offaster pilula - Revision history

Dbk: Created page with "The subzone is only developed in southern England. In Northern Ireland, a non-sequence is thought to omit this horizon (Wilson & Manning, 1978). '''Base''': In southern Engla..."