北京地区中生代若干地质问题讨论

从中生代早期较隐蔽与微弱的东西向褶皱与断裂、沉积岩层含火山灰并未受变质、地层超覆与不整合接触关系及岩浆活动等方面，探讨印支运动在北京地区的存在和特点；从中生代中、晚期较广泛而剧烈的北东向褶皱与断裂、地层缺失与超覆或不整合关系、火山喷发与岩浆侵入活动等方面，讨论燕山运动在北京地区的存在和特点；根据早白垩世古植物与孢粉组合特征，结合邻区资料，指出北京地区属于我国早白垩世南、北孢粉－植物地理区之间的过渡区。最后讨论早侏罗世蔡家岭组建组问题。

On some Mesozoic geological problema in Beijing area

The existence and characteristics of the Indo-China Movement and Yenshan Movement in the Beijing area are discussed in the paper, based on the stratigraphic sequence and contacts, folds and faults, magmatic intrusion and volcanic activity, metamorphism,etc. during the Mesozoic. The sporo-pollen features in the Early Cretaceous are further studied. Establishment of the Caijialing Formation is discussed also.