大兴安岭─燕山地层分区中、新生代地层

MESO-CENOZOIC STRATIGRAPHY IN DA HINGGAN LING-YANSHAN STRATIGRAPHYCAL SUBPROVINCE

对大兴安岭和燕山北部的中生代地层，进行了系统的总结。侏罗纪早中期为含煤地层，晚期为以兴安岭群为代表的火山堆积；白垩纪早期为火山－沉积含煤地层，晚期为红层。第三纪以二连盆地合大量哺乳动物群的杂色沉积为特征。

The Mesozoic stratigraphy of Da HingganLing- Yianshan stratigraphical subprovince are systemetically summed up, The Early Middle Jurassic is characterized by coal -bearing strata, the Late Jurassic by volcanic accumulation represented by Hingganling group,Early Cretaceous by coal -bearing volcnic - sedimentary rocks and Late Cretaceous by red beds.The Tertiary is represented by varicolored deposits yeilding a great deal of mammal fossils in Eren basin.