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Hints, L., 2012b

New Hirnantian orthide brachiopods from the type section of the Porkuni Stage (Porkuni quarry, northeastern Estonia)

Hints, L.
DOI10.3176/earth.2012.4.04
Year2012
JournalEstonian Journal of Earth Sciences
Volume61
Number4
Pages227–241
Typearticle in journal
Figures6
OpenAccess
LitsentsCC BY 4.0
Estonian author
LanguageEnglish
Id752

Abstract

Four new Hirnantian species of orthide brachiopods, Sigmelasma peepi, Mendacella aerinensis, Drabovia? minuta and Tyronella siugensis are described from the type section of the Porkuni Regional Stage in the Porkuni quarry, northeastern Estonia. These species occur in the reef-related shallow-water bituminous limestone (Siuge Member of the Ärina Formation). Sigmelasma peepi and Tyronella siugensis represent the families Wangyuiidae and Tyronellidae, respectively, which were hitherto unknown in the Baltic Ordovician. Additionally, a harknessellid Reuschella sp. is described from the stromatoporoid-coral reefs (Tõrevere Member) and skeletal grainstone (Vohilaid Member) of the same locality and formation. Together these new finds extend our knowledge of the latest Ordovician brachiopod fauna in the Baltic region, showing higher than previously expected diversity of the Porkuni Stage and distinctness of reef-related brachiopods in the shallow shelf environment. The new species are not present in the Hirnantia brachiopod fauna in deeper-water environments of the Central East Baltic.

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