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A diverse bryozoan fauna from Pleistocene marine gravels at Kuromatsunai, Hokkaido, Japan
Taylor, P.D.; Dick, M.H.; Clements, D.; Mawatari, S.F. (2013). A diverse bryozoan fauna from Pleistocene marine gravels at Kuromatsunai, Hokkaido, Japan, in: Ernst, A. et al. (Ed.) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, 143: pp. 367-383. hdl.handle.net/10.1007/978-3-642-16411-8_25
In: Ernst, A. et al. (Ed.) (2013). Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, 143. Springer: Berlin. ISBN 978-3-642-16410-1. viii, 463 pp., more
In: Lecture Notes in Earth System Sciences. Springer: Heidelberg; Berlin. ISSN 2193-8571, more

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Keywords
    Palaeoecology; Palaeoenvironments; Pleistocene; Species diversity; Bryozoa [WoRMS]; INW, Japan, Hokkaido [Marine Regions]; Marine

Authors  Top 
  • Taylor, P.D.
  • Dick, M.H.
  • Clements, D.
  • Mawatari, S.F.

Abstract
    A remarkable locality, nicknamed ‘Kokemushi Paradise’, at the town of Kuromatsunai in Hokkaido, northern Japan, exposes 6.5 m of the Nakasato Conglomerate Member of the Pleistocene Setana Formation, dated at about 1.2–1.0 Ma. The sediment consists of marine gravels containing abundant shells, pebbles and cobbles, most densely encrusted by bryozoans that are typically well preserved. Broken branches of erect bryozoans, especially Myriapora, are common in the matrix. Several bryozoan genera are recorded for the first time in the fossil record, notably the cold-water genera Septentriopora, Harmeria, Doryporella and Rodinopora. Up to 25 bryozoan species can be found on a single clast, and 120 bryozoan species have been provisionally identified, dominated by ascophoran cheilostomes. Although this species richness is high compared to other fossil bryozoan assemblages from marine gravels, viewed in the context of bryozoan diversities in modern rocky subtidal habitats in the northern Pacific region it may be unexceptional. Lack of calcareous algae and presence of stylasterid hydrocorals suggest a subtidal environment, possibly in a fast-flowing channel between the Sea of Japan and the Pacific Ocean.

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