Range, proportionate representation, and demise of brachiopod families through Permian Period

Autor:	J. B. Waterhouse, G. Bonham-Carter
Rok vydání:	1976
Předmět:	food.ingredient Permian biology Biome Geology Demise biology.organism_classification Orthida Paleontology food Ophiceras Time range Trophic level Marine transgression
Zdroj:	Geological Magazine. 113:401-428
ISSN:	1469-5081 0016-7568
DOI:	10.1017/s001675680005072x
Popis:	SummaryThe time range and proportional distributions of Permian brachiopod families are summarized for the Permian Period. The ‘imperfection’ of the record is calculated from the apparent absences of families known to have survived. It is shown that the phylum changed in composition during the late Middle and Late Permian, with increased importance of Orthida, Strophalosiacea, and Oldhaminida at the expense of the Productacea. Changes were over-printed by loss of families, markedly later than the extensive contraction of shelf-seas, concurrent probably with significant changes in geo chemistry and trophic resources. A number of highly significant families survived into the time of renewed transgression during the Otoceras and Ophiceras ammonoid zones, usually classed at the base of the Triassic Period. The demise of most Permian families proceeded in concert with climatic changes, but the initial deaths of families appear to have been caused by some other unknown factor, which may have severely disrupted Permian communities and biomes, and caused them to respond more than usual to climatic oscillations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3c3a4e8e172adfc3dadfe5d623d4a3bc https://doi.org/10.1017/s001675680005072x Zobrazit plný text záznamu