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青海玛多县长石头山广泛出露一套岛礁灰岩,此前由于在本区未发现大量的■类化石,前人认为其归属于阿尼玛卿小区,这次在岛礁灰岩中发现了11属19种■类化石,在此基础上建立了两个■带,自下而上为Parafusulina带和Neoschwagerina margaritae带。由此确定树维门科组岛礁灰岩时代为中二叠世茅口亚世孤峰期。此外,该区■类化石生物群面貌与华南地区■类化石生物群面貌极为相似,因此在中二叠世时该区属于特提斯区。根据■类化石的分布特点及其面貌特征,将长石头山岛礁划归于巴颜喀拉小区(古生物地理分区)。
A set of reef limestone was widely exposed in Shetoushan, Maduo County, Qinghai Province. Previously, no large number of fossils were found in this area. Previously, it was thought to belong to Animaqing district. This time in the reef limestone Found 11 genera and 19 species of fossils, on the basis of the establishment of two ■ belt, bottom-up to Parafusulina band and Neoschwagerina margaritae band. Thus, it was determined that the reef limestone age of the Tree-Dimensional Archipelago was the only Permian in the Late Permian Maokou. In addition, the fossil biofacies in this area are similar in appearance to the fossil biota in southern China, so this area belonged to the Tethys area during the Middle Permian period. According to the distribution characteristics of fossils and their features, the long-rocky island reefs are assigned to the Bayan Har area (Paleo-biogeographical area).