大塘坡组黑色页岩为中国扬子地台新元古代间冰期沉积。在湖北长阳古城和湖南花垣民乐的大塘坡组黑色页岩中检测到沟鞭藻的生物标志化合物——甲藻甾烷 ,这是目前国内地质时代最早的甲藻甾烷的检出报道。结合其它化石资料 ,表明沟鞭藻与其它真核藻类的系统发生至少在新元古代就已经完成 ,这与真核生物在新元古代冰期结束前就有很大发展的推测相一致 The black shale in Datangpo Formation is a Neoproterozoic glacial deposition on the Yangtze platform in China. In the ancient city of Changyang, Hubei Province and Hunan Huayuan Minla Datang Formation black shale detected dinoflagellate biomarker compound - dinostellin, which is currently the earliest geological geological dinosaur sterane reported detection. The combination of other fossil data suggests that the phylogeny of Daphniphyllum and other eukaryotic algae has been completed, at least in the Neoproterozoic, consistent with the much evolved speculation of eukaryotes before the end of the Neoproterozoic glacial period