The first sphinctozoan-bearing reef from an Ordovician back-arc basin

Li Q, Li Y, Kießling W (2015)

Publication Type: Journal article, Original article

Publication year: 2015


Publisher: Springer Verlag (Germany)

Book Volume: 61

Pages Range: 9pp.

Journal Issue: 17

DOI: 10.1007/s10347-015-0444-6


Although sphinctozoans, multi-chambered hypercalcified sponges, can be traced from the Cambrian, their reef-building capacity in the Early Paleozoic appears limited. The oldest sphinctozoan-coral-microbial reef‏ is documented here, from the Upper Sanqushan Formation (Late Katian) of southeast China. This is also the first report of Ordovician sphinctozoans from South China. The sponges occur in a >120-m-thick reef that is mainly constructed by calcimicrobes (Kordephyton, Renalcis, and Epiphyton) with a low abundance of in situ metazoans, predominantly sphinctozoan sponges (Corymbospongia) and rugose corals (mostly Palaeophyllum and Streptelasma). Tetradium is the only tabulate coral preserved in growth position. Crinoids and brachiopods are common reef dwellers. Dasycladacean algae are rare and probably transported and stromatactis is abundant. Bio- and litho-facies in this area as well as the characteristics of the microbialite suggest that the reef developed in a deeper subtidal setting that was unfavorable for most metazoan reef builders. In contrast to the high-energy stromatolite-sphinctozoan reefs from the Late Silurian, this case represents a low-energy community, indicating that the first reef-building sphinctozoans might have originated in a relatively deep-water environment on seamounts of a back-arc basin during the Late Ordovician.

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Li, Q., Li, Y., & Kießling, W. (2015). The first sphinctozoan-bearing reef from an Ordovician back-arc basin. Facies, 61(17), 9pp..


Li, Qijian, Yue Li, and Wolfgang Kießling. "The first sphinctozoan-bearing reef from an Ordovician back-arc basin." Facies 61.17 (2015): 9pp.

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