【摘要】 <正> 一、前言黑龙江省东部地区(图1)中生代地层较为发育,含有丰富的煤炭资源。它们以鸡西群及龙爪沟群为代表。前者以陆相含煤沉积为主,夹有少量海相沉积,后者则以海陆交互相沉积为主,夹多层火山岩。两群剖面清楚,化石丰富,是研究我国侏罗—白垩系界限的重要地区之一。同时,对两群的正确划分与对比,也将有助于煤田普查、勘探及预测。更多还原

【Abstract】 The Well-known Late Jurassic paralic coaly Longzhaogou Group is distributedin Mishan, Hulin and Baoqing counties, the Eastern part ot Heilongjiang provinceof Northeastern China. It rests unconformablly upon the proterozoic Mashan Groupand is also unconformablly overlain by Tertiary basalt. Stratigraphically, it is divi-ded in ascending order into Dongshengcun Formation (东胜村组), Peide Formation(裴德组) and Yunshan Formation (云山组). From fhe Paleontological evidence, es-pecially the Actocephalites-Entolium demmisium molluscan fauna, Camptonectes lens--Corbicellopsis ovalis bivalve fauna and Scabriculocypris--Mandelstamia ostracodefauna found in Peide Formation and Yunshan Formation respectively, it may beconsidered to be ranging from Bathonian to Volgian in age. Furthermore, owing tothe discovery of a marine bed which underlies conformablly the Chengzihe Formati-on (the Middle Part of Jixi Group) located at Jidong, Boli and Shuangyashan cou-nties and investigation of micro- and macrofossils found in this bed, such as Corbi-cellopsis ovalis, Arcomya sp., Scabriculocypris aff. cerastes, some Gymnospermaepollen grains and a small amount of Pteridophytes spores (Osmudacidites, Cyathi-dites……) etc., itis suggested that this marine bed can be corelated to the UpperPart of Yunshan Formation while the Didao Formation of Jixi County (the LowerPart of Jixi Group) disconformablly underlain the Chengzihe Formation may beequivalent to the Middle and Lower Part of Yunshan Formation evidently。更多还原