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一、前言我国的海相侏罗系有两种类型。一种是特提斯(Tethys)型,属于这一类型的有西藏、青海南部、新疆、滇西等地区的海相侏罗系,这些地层的岩性和动物群性质或多或少都能与欧洲、印度西部、东非甚至东印度群岛的侏罗系相对比。另一种是环太平洋型,属于这一类型的包括湖南、广东、东北等地区的海相侏罗系。除东北拉丹哈达岭有侏罗纪的海相沉积外,其余地区仅含有海相里阿斯统的中下部。关于在中国以及中南半岛地区特提斯型与环太平洋型两种里阿斯时期海相地层的关系,至今仍然不清楚。滇西是我国海相中生代地层发育比较好的地区之一,过去虽然经过洛齐(L.vonLoczy,1893年)和布朗(Brown,Coggin J.,1916年)等人的调查,但对中生代地层,尤其是侏罗系缺乏详细研究。
I. Preface There are two types of marine Jurassic in our country. One is of the Tethys type and belongs to this type of marine Jurassic in the areas of Tibet, southern Qinghai, Xinjiang and western Yunnan. The lithology and fauna characteristics of these formations are more or less Compared with the Jurassic in Europe, western India, East Africa and even the East Indies. The other is the Pacific Rim, belonging to this type of marine Jurassic including Hunan, Guangdong and Northeast China. In addition to Jurassic marine sediments in the northeastern Lada Hada Ridge, the rest of the area contains only the middle and lower parts of the marine riastem. The relationship between the two Tiberian and Pacific Rim marine strata in China and the Indochina Peninsula remains unclear. Western Yunnan is one of the regions where the marine strata in the Mesozoic have developed well in China. In the past, though investigations were made by L. von Loczy (1893) and Brown (Coggin J., 1916) In particular, the Jurassic lack of detailed research.