Non-marine bivalves and associated burrows in the catskill magnafacies (upper devonian) of New York State

Abstract

Large, near-vertical, endichnial burrows with distinctive meniscate fillings are associated with in situ moulds of the bivalve Archanodon within river-channel and overbank deposits of the Frasnian Oneonta and Walton Formations, New York State. The burrows are interpreted as due to upward escape of bivalves, following workers such as Eagar, Berg, Thoms, Hardy and Broadhurst, who described similar occurrences from late Paleozoic fluvial and deltaic deposits. Trails passing laterally into the in situ Archanodon moulds indicate that the bivalves moved around on the channel bar surfaces. Vertically-oriented, large Beaconites burrows are similar to those described here, and may have similarly originated by bivalve escape.