A kind of coccoid dinoflagellates-like fossils gives a new explanation of source of dinosterane in the Early-Middle Cambrian

The coccoid fossils covered with thick gelatinous envelop containing severa l gametes are discovered in gyps and salt deposits of Cambrian, H-4 well an d chert bed of the base of Yuertus Formation (is an element of (1)(1)) of X iaoerbulake Section. The fossils are described and compared with coccoid di noflagellates. These fossils may be a coccoid life-cycle stage (vegetative cyst) of coccoid dinoflagellates. If this identification is correct, the co ccoid dinoflagellates-like fossils could give a reasonable explanation of t he dinoflagellate-specific biomarkers from Cambrian, H-4 well, Tarim Basin.