松辽盆地东缘晚期中生代一个新的重要含煤层位

叙述了松辽盆地东缘早白垩世早期营城组之上的一个新的重要含煤层位。有植物化石30属60种,未发现原始被子植物化石。此含煤层位代表松辽盆地东缘一个重要成煤期,应建立一个新地层单位——大羊草沟组,其时代为早白垩世早期。

THE COAL-BEARING HORIZON OF THE LATE MESOZOIC IN THE EASTERN EDGE OF THE SONGLIAO BASIN, JILIN PROVINCE

The coal-bearing strata of early Cretaceous has significant industrial value. It is existed on the Yingcheng formation with three kinds of ore deposits. It is called Dayangcaogou formation. This formation is mainly distributed in Liutai, Yingcheng, Yangcaogou, Shibailing, Liufangzi and Mengjialing etc. It comprise volcanicalastic rocks, bentonite clastic rocks and four coal-beds, in which abundant phytolite can be found.The animal fossis and the Pteridosper-mopsida differ from those of Shahezi formation of the late Jurassic. The species division of the Filices, Cycadopsida, Coniferopsida, Ginkgopsida is more obvious than those in Shahezi formation. Although some of the early Cretaceous species. Such "as: Coniopteris arctica, Acanthopteris gothani, A. alata, Onychiopsis elongata, Ruffordia goepperti, Gleichenites cycadina, Arc-toperis rarinervis, Sagenopteris elliptica,Pterophyllum baotoum, Ginkgo adian-toides, Neozamites verchojensis etc are found in this area which are normally occurred in north American, Britain, far-eastern Russia and Japan etc. The fossil of original Angiospermae has not been found yet. Therefore, the authors consider that this horizon belong to the early stage of eastern of Early Cretaceous in age.