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Hints, L., 2010

A new glyptorthid species (Brachiopoda: Orthida) from the Upper Ordovician of Estonia

Hints, L.
DOI10.3176/earth.2010.3.01
Aasta2010
AjakiriEstonian Journal of Earth Sciences
Köide59
Number3
Leheküljed189-194
Tüüpartikkel ajakirjas
Joonised4
OpenAccess
LitsentsCC BY 4.0
Eesti autor
Keelinglise
Id1569

Abstrakt

A new glyptorthid brachiopod species Bassettella alata with surface pits and lamellose frills is described from the Upper Ordovician Haljala and Keila stages of northern Estonia. The new species appears in the Jõhvi Substage of the Haljala Stage (mid-Sandbian) and is somewhat younger than the type species B. gracilis appearing in the lower Idavere Substage of the same stage in NW Russia. In the uppermost Keila Stage (lowermost Katian), B. alata belongs to a mixed faunal association of the marginal facies of the Vasalemma Formation comprising the oldest Ordovician reefs in Estonia. The distribution pattern of brachiopods of the genus Bassettella shows a westward shift in time and changes in shell morphology from subrectangular to subtriangular with alate cardinal extremities.

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