Dbk: Created page with "This zone is only currently used in northern England (Whitham, 1991) because the standard zonal equivalents (''Offaster pilula'' Zone & ? ''G. quadrata'' Zone pars) cannot be ..."

2013-09-26T14:14:35Z

Created page with "This zone is only currently used in northern England (Whitham, 1991) because the standard zonal equivalents (''Offaster pilula'' Zone & ? ''G. quadrata'' Zone pars) cannot be ..."

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This zone is only currently used in northern England (Whitham, 1991) because the standard zonal equivalents (''Offaster pilula'' Zone & ? ''G. quadrata'' Zone pars) cannot be recognised.

'''Base''': The base of the zone is placed at marl SY23 of Whitham (1993).

'''Top''': The ''I. lingua'' Zone is the youngest exposed zone in the Chalk Group of northern England, and thus its top is undefined.

'''Range of index species''': The index ranges from within the ''M. testudinarius'' Zone, through the ''U. anglicus'' Zone, to the top of the nominate zone (Whitham, 1993; Mitchell, 1995).

'''Key fauna''':
{| class="Wikitable"
| Porifera: || locally abundant & well preserved sponges
|-
| Bivalvia: || ''Pseudoperna boucheroni''
|-
| ||''Sphenoceramus'' (''Inoceramus'') ''lingua''
|-
| ||''S. patootensis''
|-
| ||'' S. pinniformis''
|-
| ||'' S. steenstrupi''
|-
| Belemnoidea:|| ''Gonioteuthis'' spp.
|-
| Ammonoidea: ||''Baculites'' spp.
|-
| ||''Discoscaphites binodosus''
|-
| ||''Scaphites'' spp.
|-
| Echinoidea: || ''Echinocorys'' spp.
|-
| ||''Offaster pilula''
|}
'''Faunal abundance & preservation''': The zone is quite richly fossiliferous, and there are local concentrations of sponges, echinoids and bivalves.

'''Bio-markers''': In the lower part of the zone ''Sphenoceramus pinniformis'' is common, with acmes of the oyster ''Pseudoperna boucheroni'' and large domed ''Echinocorys'' associated with a rich fauna of well preserved sponges, forming the famous Flamborough Sponge Beds (Whitham, 1993). In the middle of the zone is a further, un-named, sponge bed, above which ''Sphenoceramus patootensis'' occurs, with rare ''Offaster pilula'', and pyramidate morphotypes of ''Echinocorys'' (Whitham, 1993). In the top of the zone, ''Discoscaphites binodosus'' occurs with ''Baculites'', ''Micraster glyphus'', ''M. schroederi'', ''Sphenoceramus steenstrupi'' and conical and globose morphotypes of ''Echinocorys'' (Whitham, 1993).

'''Subzones''': ''Discoscaphites binodosus'' Subzone

'''Age''': Campanian

[[category:Standard zonation | 035]]

Sphenoceramus (Inoceramus) lingua Zone - Revision history

Dbk: Created page with "This zone is only currently used in northern England (Whitham, 1991) because the standard zonal equivalents (''Offaster pilula'' Zone & ? ''G. quadrata'' Zone pars) cannot be ..."