THE SIGNIFICANCE OF THE GRAPTOLOID AMPHIGRAPTUS DIVERGENS FROM THE (MID-RAWTHEYAN) TYPE SECTION OF THE ASHGILL SERIES, ORDOVICIAN

dc.contributor.author	Rickards R.B.
dc.date.accessioned	2022-03-14T06:51:03Z
dc.date.available	2022-03-14T06:51:03Z
dc.date.issued	2004
dc.identifier	https://www.elibrary.ru/item.asp?id=8812129
dc.identifier.citation	Geological Magazine, 2004, 141, 6, 735-738
dc.identifier.issn	0016-7568
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/36251
dc.description.abstract	Amphigraptus divergens Lapworth is known to be restricted, in Britain, to the linearis Biozone, and its occurrence in the type Ashgill Series reinforces Rickards' prior independent attribution of that part of the type Ashgill to the linearis Biozone. The thecal structure revealed in this paper allies A. divergens to the dicellograptids rather than the leptograptids, hence it is placed in the family Dicranograptidae. The evolutionary origin of Amphigraptus is almost certainly rooted in Dicellograptus.
dc.subject	ASHGILL SERIES
dc.subject	ORDOVICIAN
dc.subject	GRAPTOLITES
dc.title	THE SIGNIFICANCE OF THE GRAPTOLOID AMPHIGRAPTUS DIVERGENS FROM THE (MID-RAWTHEYAN) TYPE SECTION OF THE ASHGILL SERIES, ORDOVICIAN
dc.type	Статья
dc.subject.age	Paleozoic::Ordovician
dc.subject.age	Палеозой::Ордовикская	ru

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