Abstract
Proconchidium brodeurensisn. sp. occurs 212 m above the base of member B of the Baillarge Formation on Brodeur Peninsula, Baffin Island, 8 m below the Ordovician–Silurian boundary. Study ofProconchidiumshows that it can be easily distinguished fromEoconchidiumbut possesses many characters that are similar to those inTcherskidium. Analysis of internal structures suggests that the three genera can be distinguished from each other and belong to Virgianidae. Tcherskidiidae is a synonym of Virgianidae and should be abandoned.This represents the first recorded occurrence ofProconchidiumin North America. Although this genus and its related generaTcherskidiumSapelnikov, 1972, andEoconchidiumRozman, 1967, are common in Ashgill strata of Eurasia, they have not been recorded or illustrated from North America. This led to the suggestion that distinct brachiopod biogeographic provinces may have existed during the Ashgill. The occurrence of these genera probably indicates that they may have lived in mostly tropical and subtropical zones.
Published Version
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