The Early Devonian (Emsian) acrotretid microbrachiopod Opsiconidion minor Popov, 1981, from the Alaska/Yukon Territory border and Novaya Zemlya

Holmer, Lars E., 1960- (author): Uppsala universitet,Paleobiologi,State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life & Environments, Department of Geology,Northwest University, Xi’an, 710069 China

Blodgett, Robert B. (author): Blodgett & Associates, LLC (Geological & Paleontological Consultants) 2821 Kingfisher Drive Anchorage, Alaska 99502 USA

Liang, Yue (author): Uppsala universitet,Paleobiologi,State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life & Environments, Department of Geology,Northwest University, Xi’an, 710069 China

Zhang, Zhifei (author): State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life & Environments, Department of Geology,Northwest University, Xi’an, 710069 China

(creator_code:org_t)

Estonian Academy Publishers, 2020
2020
English.
In: Estonian journal of earth sciences. - : Estonian Academy Publishers. - 1736-4728 .- 1736-7557. ; 69:3, s. 143-153

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Abstract Subject headings

New records of the poorly known acrotretid (Biernatidae) microbrachiopod Opsiconidion minor Popov are described from middle Emsian strata of the Ogilvie Formation in eastcentral Alaska and the adjacent Yukon Territory, Canada, and compared with new betterpreserved topotypes from the late Early Devonian (Emsian) of Novaya Zemlya, Russia. In Alaska O. minor occurs together with fragmentary material of Lingulipora sp. and an indeterminate discinid. The only other previous record of O. minor, outside the type area, comes from the Early to ?Middle Devonian (Pragian to ?Givetian) of Australia (Victoria and NSW). Opsiconidion Ludvigsen is a stratigraphically extremely longranging and cosmopolitan acrotretid, which exhibits a remarkable conservatism; the morphology of the ventral valve remains essentially unchanged from the earliest Ordovician (Darriwilian) records to the Devonian.

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)

By the author/editor: Holmer, Lars E., ...; Blodgett, Robert ...; Liang, Yue; Zhang, Zhifei

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Other Earth and ...

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