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A new Ordovician chiastoclonellid sponge from Inner Mongolia, China
Published online by Cambridge University Press: 11 August 2017
Extract
Lower paleozoic facies relationships, fossils, and depositional systems of the Northwest Ordos Basin, northern China, are sparsely documented in western world literature (Meng et al., 1997; Kessel, 2005). Recent field work in this area during the summer of 2004 recovered a single specimen of a new chiastoclonellid sponge. That sponge, described here, was collected from a measured section of Lower Paleozoic rocks exposed in the Suhaitu area, in the northern part of the Zhuozi Shan Range, northwestern Ordos Basin (Fig. 1), in southern Inner Mongolia Province. The Zhuozi Shan Range is part of the western Ordos fold and thrust belt, a Late Jurassic–Early Cretaceous tectonic feature, that brought Lower Paleozoic rocks to the surface (Darby and Ritts, 2002; Darby, 2003). Early Paleozoic rocks exposed in the area are dominantly carbonates with minor siliciclastic rocks and they span from the Early Cambrian through the Middle Ordovician (Yang et al., 1992; Meng et al., 1997). They are unconformably overlain by Middle Carboniferous units across the North China Block (Meng et al., 1997).
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