Rare finds of the coiled cephalopod Discoceras from the Upper Ordovician of Bornholm, Denmark

Jan Audun Liljeroth Rasmussen; Finn Surlyk

Rare finds of the coiled cephalopod Discoceras from the Upper Ordovician of Bornholm, Denmark

Jan Audun Liljeroth Rasmussen, Finn Surlyk

Geologi

2 Citationer (Scopus)

26 Downloads (Pure)

Abstract

Coiled nautiloid cephalopods of the genus Discoceras are locally common in the Middle and Upper Ordovician of Baltica, for example in the Oslo Graben, but are exceedingly rare in contemporaneous strata from the Danish island of Bornholm. The two new species of Discoceras described here, D. costatum n. sp. and D. vasegaardense n. sp., occur in shales of the Upper Ordovician Lindegård Formation. The nautiloids are preserved as external molds in laminated siliciclastic mudstones. The very rare occurrence of cephalopods, combined with the apparently endemic nature of the Discoceras fauna, may be explained by the location of Bornholm distally on the Baltoscandian shelf combined with the influence of relatively cold ocean currents from the adjacent Rheic Ocean.

Originalsprog	Engelsk
Tidsskrift	Bulletin of the Geological Society of Denmark
Vol/bind	60
Sider (fra-til)	15-22
Antal sider	8
ISSN	0011-6297
Status	Udgivet - 2012

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Citationsformater

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abstract = "Coiled nautiloid cephalopods of the genus Discoceras are locally common in the Middle and Upper Ordovician of Baltica, for example in the Oslo Graben, but are exceedingly rare in contemporaneous strata from the Danish island of Bornholm. The two new species of Discoceras described here, D. costatum n. sp. and D. vasegaardense n. sp., occur in shales of the Upper Ordovician Lindeg{\aa}rd Formation. The nautiloids are preserved as external molds in laminated siliciclastic mudstones. The very rare occurrence of cephalopods, combined with the apparently endemic nature of the Discoceras fauna, may be explained by the location of Bornholm distally on the Baltoscandian shelf combined with the influence of relatively cold ocean currents from the adjacent Rheic Ocean.",

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T1 - Rare finds of the coiled cephalopod Discoceras from the Upper Ordovician of Bornholm, Denmark

AU - Rasmussen, Jan Audun Liljeroth

AU - Surlyk, Finn

PY - 2012

Y1 - 2012

N2 - Coiled nautiloid cephalopods of the genus Discoceras are locally common in the Middle and Upper Ordovician of Baltica, for example in the Oslo Graben, but are exceedingly rare in contemporaneous strata from the Danish island of Bornholm. The two new species of Discoceras described here, D. costatum n. sp. and D. vasegaardense n. sp., occur in shales of the Upper Ordovician Lindegård Formation. The nautiloids are preserved as external molds in laminated siliciclastic mudstones. The very rare occurrence of cephalopods, combined with the apparently endemic nature of the Discoceras fauna, may be explained by the location of Bornholm distally on the Baltoscandian shelf combined with the influence of relatively cold ocean currents from the adjacent Rheic Ocean.

AB - Coiled nautiloid cephalopods of the genus Discoceras are locally common in the Middle and Upper Ordovician of Baltica, for example in the Oslo Graben, but are exceedingly rare in contemporaneous strata from the Danish island of Bornholm. The two new species of Discoceras described here, D. costatum n. sp. and D. vasegaardense n. sp., occur in shales of the Upper Ordovician Lindegård Formation. The nautiloids are preserved as external molds in laminated siliciclastic mudstones. The very rare occurrence of cephalopods, combined with the apparently endemic nature of the Discoceras fauna, may be explained by the location of Bornholm distally on the Baltoscandian shelf combined with the influence of relatively cold ocean currents from the adjacent Rheic Ocean.

KW - Faculty of Science

M3 - Journal article

SN - 0011-6297

VL - 60

SP - 15

EP - 22

JO - Bulletin of the Geological Society of Denmark

JF - Bulletin of the Geological Society of Denmark

ER -