Dbk at 11:36, 26 September 2013

2013-09-26T11:36:37Z

← Older revision		Revision as of 12:36, 26 September 2013
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	{\| class="Wikitable"		{\| class="Wikitable"
	\| Brachiopoda: ''Orbirhynchia mantelliana''		\| Brachiopoda: \|\| ''Orbirhynchia mantelliana''
	\|-		\|-
	\| Bivalvia: ''Inoceramus virgatus''		\| Bivalvia: \|\| ''Inoceramus virgatus''
	\|-		\|-
	\| Ammonoidea: ''Acompsoceras'' spp.		\| Ammonoidea: \|\|''Acompsoceras'' spp.
	\|-		\|-
	\| \|\|''Hyphoplites'' spp.		\| \|\|''Hyphoplites'' spp.
			\|-
	\| \|\|''Mantelliceras dixoni''		\| \|\|''Mantelliceras dixoni''
			\|-
	\| \|\|''M. saxbii''		\| \|\|''M. saxbii''
			\|-
			\| \|\|''M''. spp.
			\|-
	''M''. spp.		\| \|\|''Mesoturrilites'' spp.
			\|}


	''Mesoturrilites'' spp.



	'''Faunal abundance & preservation''': Some fauna present as acmes (''O. mantelliana'', ''I.'' ''virgatus''), and ''M. dixoni'' is locally abundant in a hard limestone bed (see: Bio-markers).		'''Faunal abundance & preservation''': Some fauna present as acmes (''O. mantelliana'', ''I.'' ''virgatus''), and ''M. dixoni'' is locally abundant in a hard limestone bed (see: Bio-markers).



	'''Bio-markers''': An acme of ''Inoceramus virgatus'' occurs slightly below the middle of the Zone, immediately overlain by an acme of ''M. dixoni'' in a hard limestone band ('M3' of Gale, 1989, also known as the Dixoni Limestone). Locally (eg. Leighton Buzzard district) the Dixoni Limestone is also characterised by common ''I. virgatus''. Just above the Dixoni Limestone, at about the middle of the ''M. dixoni'' Zone, there is an acme of ''Orbirhynchia'' ''mantelliana'', representing the lowest of three widely occurring acmes of this brachiopod in the Cenomanian (Gale, 1989, 1995; Robaszynski ''et al''., 1998).		'''Bio-markers''': An acme of ''Inoceramus virgatus'' occurs slightly below the middle of the Zone, immediately overlain by an acme of ''M. dixoni'' in a hard limestone band ('M3' of Gale, 1989, also known as the Dixoni Limestone). Locally (eg. Leighton Buzzard district) the Dixoni Limestone is also characterised by common ''I. virgatus''. Just above the Dixoni Limestone, at about the middle of the ''M. dixoni'' Zone, there is an acme of ''Orbirhynchia'' ''mantelliana'', representing the lowest of three widely occurring acmes of this brachiopod in the Cenomanian (Gale, 1989, 1995; Robaszynski ''et al''., 1998).



	'''Subzones''': None formally recognised in the UK. Gale (1995) recognised three faunal assemblages, successively comprising: (a) common ''M. dixoni'' and ''M. saxbii'', with acme of ''Inoceramus virgatus''; (b) diverse turrilitids, including ''Mesoturrilites'' spp.; (c) diverse ''Mantelliceras'' and rarer ''Acompsoceras'' and ''Hyphoplites''.		'''Subzones''': None formally recognised in the UK. Gale (1995) recognised three faunal assemblages, successively comprising: (a) common ''M. dixoni'' and ''M. saxbii'', with acme of ''Inoceramus virgatus''; (b) diverse turrilitids, including ''Mesoturrilites'' spp.; (c) diverse ''Mantelliceras'' and rarer ''Acompsoceras'' and ''Hyphoplites''.



	'''Age''': Early Cenomanian		'''Age''': Early Cenomanian
	[[category:Standard zonation \| 005]]		[[category:Standard zonation \| 005]]

Dbk: Created page with "'''Base''': The base of the ''M. dixoni'' Zone is immediately below the first occurrence of the index species (Gale, 1995). '''Top''': The top of the ''M. dixo..."

2013-09-26T10:34:39Z

Created page with "'''Base''': The base of the ''M. dixoni'' Zone is immediately below the first occurrence of the index species (Gale, 1995). '''Top''': The top of the ''M. dixo..."

New page

'''Base''': The base of the ''M. dixoni'' Zone is immediately below the first occurrence of the index species (Gale, 1995).

'''Top''': The top of the ''M. dixoni'' Zone is immediately below the first occurrence of the ammonite ''Cunningtoniceras inerme'' (Gale, 1995).

'''Range of index species''': The index species is restricted to the lower part of the ''M. dixoni'' Zone (Robaszynski ''et al''., 1998).

'''Key Fauna''':

{| class="Wikitable"
| Brachiopoda: ''Orbirhynchia mantelliana''
|-
| Bivalvia: ''Inoceramus virgatus''
|-
| Ammonoidea: ''Acompsoceras'' spp.
|-
| ||''Hyphoplites'' spp.
| ||''Mantelliceras dixoni''
| ||''M. saxbii''

''M''. spp.

''Mesoturrilites'' spp.

'''Faunal abundance & preservation''': Some fauna present as acmes (''O. mantelliana'', ''I.'' ''virgatus''), and ''M. dixoni'' is locally abundant in a hard limestone bed (see: Bio-markers).

'''Bio-markers''': An acme of ''Inoceramus virgatus'' occurs slightly below the middle of the Zone, immediately overlain by an acme of ''M. dixoni'' in a hard limestone band ('M3' of Gale, 1989, also known as the Dixoni Limestone). Locally (eg. Leighton Buzzard district) the Dixoni Limestone is also characterised by common ''I. virgatus''. Just above the Dixoni Limestone, at about the middle of the ''M. dixoni'' Zone, there is an acme of ''Orbirhynchia'' ''mantelliana'', representing the lowest of three widely occurring acmes of this brachiopod in the Cenomanian (Gale, 1989, 1995; Robaszynski ''et al''., 1998).

'''Subzones''': None formally recognised in the UK. Gale (1995) recognised three faunal assemblages, successively comprising: (a) common ''M. dixoni'' and ''M. saxbii'', with acme of ''Inoceramus virgatus''; (b) diverse turrilitids, including ''Mesoturrilites'' spp.; (c) diverse ''Mantelliceras'' and rarer ''Acompsoceras'' and ''Hyphoplites''.

'''Age''': Early Cenomanian
[[category:Standard zonation | 005]]

Mantelliceras dixoni Zone - Revision history

Dbk at 11:36, 26 September 2013

Dbk: Created page with "'''Base''': The base of the ''M. dixoni'' Zone is immediately below the first occurrence of the index species (Gale, 1995). '''Top''': The top of the ''M. dixo..."