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近年来滇、川、黔、鄂等省,相继在震旦—寒武系界线上发现了作为划界依据的多门类小壳化石,在地层古生物的研究领域里取得了重大的进展。前年,我们在石门县杨家坪测制早寒武世地层剖面时(图1),首次在下寒武统杨家坪组之底部获得有梅树村阶的小壳化石。这一新的发现,为我省“台型”沉积区的震旦—寒武系界线的正确划分与区域对比,提供了较确切的古生物依据,为有关湖南梅树村阶古动物的研究及其地质发展历史提供了新的资料。
In recent years, Yunnan, Sichuan, Guizhou, Hubei and other provinces, have found in the Aurora - Cambrian boundary as a basis for the delineation of many types of small shell fossils, paleontology in the field of research has made significant progress. Two years ago, when we measured the profile of the Early Cambrian stratigraphy in Yangjiaping, Shimen County (Figure 1), we obtained for the first time a small shell fossil with a plum tree rank at the bottom of the Yangjiaping Formation in the Lower Cambrian. This new discovery provides a more accurate paleontological basis for the correct division of the Sinian-Cambrian boundary in the “platform-type” sedimentary area of the province and its regional comparison, as well as for the study on the ancient fauna of Meishu Village in Hunan Province. Its history of geological development provides new information.