甘肃北山红石山地区早白垩世地层的发现及其时代讨论  

THE DISCOVERY AND TIME-DISCUSSION OF STRATA OF EARLY CRETACEOUS EPOCH IN HONGSHISHAN AREA OF BEISHAN, GANSU PROVINCE

作　　者：张国英[1] 孙永君 刘百成 雷树国 

机构地区：[1]甘肃省地质调查院,甘肃兰州730000 [2]甘肃省地矿局第四地勘院,甘肃酒泉735000

出　　处：《甘肃地质学报》2005年第1期5-8,共4页Acta Geologica Gansu

摘　　要：在1∶25万红宝石幅区调野外调研过程中,在甘肃北山北带红石山地区陆相沉积地层中,发现软体动物化石。经中国科学院南京地质古生物研究所鉴定,有双壳纲蚬、蚌类,腹足纲螺类,属热河动物群,其时代定为早白垩世。结合岩石地层及区域地层对比研究,将该套地层划归赤金堡组。该组的确定其意义在于澄清了长期以来,人们认为红石山地区缺失早白垩世沉积的认识。During field investigation of 1∶250 000 Hongbaoshi map of regional geological surveying, the fossil of mollusk was discovered in continental sedimentary strata of Hongshishan area of North zone of Beishan of Gansu Province. By Nanjing Geological Paleontology Institute of Chinese Academy of Sciences was it examined, there are bivalia Corbiculidae and Conchoid, Gastropoda Snail which fall into Rehe Fauna, the time is determined at Early Cretaceous Epoch. With correlation of rock strata and regional strata, this series of strata is included into Chijinbao Formation. The determination of it, is of significance at clarifying that there was not Early Cretaceous Epoch deposit in Hongshishan area.

关 键 词：北山 早白垩世 赤金堡组 

分 类 号：P534.53[天文地球—古生物学与地层学]