摘要
雅致柏型枝和拟节柏是我国早白垩世地层中常见的属种。在四川宣汉县七里峡剖面,原被归于“上侏罗统蓬莱镇组第二岩性段”也含有上述属种。据此,笔者将产上述化石的地层时代改归早白垩世,并和邻区的苍溪组、粤东的高基坪群、鄂东的灵乡群、湖南衡阳的神宝山组、浙西的寿昌组、闵西的坂头组、山东的莱阳组进行对比。雅致柏型枝和拟节柏也是四川盆地中部、东部侏罗系与白垩系分界的重要生物标志。还探讨了Frcnelopsis—Cupressinocladus组合在华南地区的分布及古地理环境。
The fossil plants Cupressinocladus elegana and Frenelopsis are common in Lower Cretaceous strata in China. In the Qilixia section of Xuanhan, Sichuan, the strata originally assigned to the 2 nd lithological member of the Upper Jurastic Penglaizhen Formation also contain the above-mentioned fossils. Therefore the authors consider that the strata should be of Early Cretaceous age and can correlate with the related strata in neighbouring areas, East China and South China. The fossil plants Cupressinocladus elegans and Frcnclopsis sp. arc the important biomarker of the Jurassic and Crctaceous boundary in the central and eastern parts of the Sichuan basin. The distribution and paleogeographical environment of the Frenelopsis-Cnpressinocladus assemblage in South China are discussed in this paper.
出处
《中国区域地质》
CSCD
1993年第4期376-380,共5页
Regional Geology of China
