Facies preference predicts extinction risk in Ordovician graptolites

The most abundant and diverse graptolite assemblages are found in offshore, deep-water black shales—the classical “graptolite facies” (deep-water or isograptid biofacies). The mean duration of Ordovician graptolite species confined to the deep-water facies (here referred to as “group 1” species) is...

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Veröffentlicht in:	Paleobiology 2010-03, Vol.36 (2), p.167-187
Hauptverfasser:	Cooper, Roger A, Sadler, Peter M
Format:	Artikel
Sprache:	eng
Schlagworte:	Aquatic habitats Biofacies Biotopes Conops Deep water Devonian Endangered & extinct species endemic taxa extinction Fauna Geological facies Geology global Graptolithina Invertebrata invertebrate Lower Devonian marine environment Mass extinction events Mass extinctions Oceans Ordovician paleoecology paleoenvironment Paleontology Paleozoic Preferences s Sea water Sediments Shallow water Silurian Species extinction Water column Water depth
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Beschreibung
Zusammenfassung:	The most abundant and diverse graptolite assemblages are found in offshore, deep-water black shales—the classical “graptolite facies” (deep-water or isograptid biofacies). The mean duration of Ordovician graptolite species confined to the deep-water facies (here referred to as “group 1” species) is 2.19 Myr, significantly shorter than the mean duration of species in the deep-water facies that are also known in sediments of the shallow-water shelf or platform (“group 2” species) −4.42 Myr, indicating a significantly higher extinction probability (p =
ISSN:	0094-8373 1938-5331
DOI:	10.1666/09043.1