CAJ | 학술논문

主要分布于冀北地区的后城组是一套以河流相红色砂砾岩为主的地层,此前在不同地点的该岩组中曾发现中侏罗世晚期的叶肢介、瓣鳃类和爬行动物化石和晚侏罗世的介形类和孢粉等化石.新近在蔚县后城组发现的孢粉组合与此前在宣化堰家沟、万全渔儿山西侧后城组晚侏罗世孢粉化石组合面貌具有明显的差异,时代属中侏罗世.孢粉化石证据说明冀北的后城组系-套中-晚侏罗世沉积.
주요분포우기북지구적후성조시일투이하류상홍색사력암위주적지층,차전재불동지점적해암조중증발현중주라세만기적협지개、판새류화파행동물화석화만주라세적개형류화포분등화석.신근재위현후성조발현적포분조합여차전재선화언가구、만전어인산서측후성조만주라세포분화석조합면모구유명현적차이,시대속중주라세.포분화석증거설명기북적후성조계-투중-만주라세침적.
The Houcheng Formation distributed in northern Hebei Province is composed mainly of the fluvial red sandstone and conglomerate rocks, occasionally with fluvial sandy mudstone and intermediate and acidic volcanic beds and partly with thin coal seams. Its age was assigned on different fossil evidences to Late Middle Jurassic, Late Jurassic or early Late Jurassic. The present palynological assemblage from this formation in Yuxian is characterized by plenty of spores Cyathidites (70% in content), with a few spore Neoraistrickia gristhorpensis, Asseretospora parva and gymnospermous pollen Classopollis, non-striate bisaccates, obviously indicating a Middle Jurassic age, and is quite different the assemblage from the same formation in Xuanhua and Wanquan which is dominate by Classopollis pollen (91% in content) , associated with some bisaccate pollen and rare Cacatricosisporites and Schizaeoisporite and was referred by Zhang Wang-ping (1984) to Late Jurassic in age. The differences between the two palynological data demonstrate that the Houcheng Formatin is a sequence from Middle to Late Jurassic age.