有关西秦岭下泥盆统的两件事实及对比

<正> 西秦岭下泥盆统的研究可分为三个阶段,1)白龙江系阶段(1944—1970):叶连俊、关士聪将含中泥盆世化石的“古道岭灰岩”以下地层称为白龙江系,人们大都认为它是志留系。直到1966年,有人根据床板珊瑚性质的分析,才提出武都一带的三河口群中包含早泥盆世沉积。对于文县一带临江组之下的地层,张祖圻(1981)划为下泥盆统。对于迭部

Tow facts concerning the correlation of the Lower Devonian of western Qinling

The Lower Devonian rocks are well developed in western Qinling and have been studied by many scholars holding different views. The following two facts are shown in the present paper. 1. There is no disconformity existing at the bottom of the Dangdogou Formation; 2. The brachiopod Nymphorhynchia? nympha occurs in the Gala Formation and not in the upper Putonggou Formation. Finally, a plan on the biostratigraphical correlation of western Qinling with Bohemia is proposed.