朝鲜安州盆地早白垩世孢粉组合

EARLY CRETACEOUS PALYNOFLORA FROM ANCHOW BASIN,KOREA

报道朝鲜安州盆地下白垩统龙盘组孢子花粉３４ 属５９ 种（包括２ 新种），并根据孢粉组合讨论了地质时代和古气候特征。龙盘组孢粉组合以裸子植物花粉为主，蕨类植物孢子次之，出现少许原始被子植物花粉。松柏纲花粉在组合中占绝对优势；海金沙科和莎草蕨科孢子则在蕨类中占优势。根据孢粉组合，龙盘组的时代应属早白垩世巴列姆期至阿普第期；安州盆地当时气候温暖偏干。

Fifty nine species of fossil spores and pollen referred to 34 genera found from the Lower Cretaceous Longpan Formation in Anchow Basin of North Korea have been studied.Two species were described as new. The palynoflora of the Longpan Formation was characterized by its predominance of gymnosperms and subdominance of pteridophyta.A few primitive angiospermous pollen grains occured in the middle to upper part of the formation.Coniferae was dominant in the whole palynoflora,while Lygodiaceae and Schizaeaceae were dominant in the pteridophyta.The important species of spores and pollen comprised Cicatricosisporites dorogensis,C.subrotundus,Lygodioisporites gemmatus,Concavissimisporites asper,C.variverrucatus,C.penolaensis,Trilobosporites minor,Klukisporites variegatus,K.pseudoreticulatus,K.scaberis,Schizaeoisporites cretacius,S.certus,S.zizyphinus,S.gansuensis,Foraminisporis wonthaggiensis,Converrucosisporites saskatchewanensis,Densoisporites microrugulatus,Parvisaccites radiatus,Platysaccus oculus,P.gansuensis,Podocarpidites canadensis,Abietineaepollenites minimus,Pinuspollenites insignis,Cedripites cretaceus,C.canadensis,Classopollis classoides,C.annulatus,C.minor,C.anchowensis,Cycadopites minimus,Ephedripites tarimensis,and Clavatipollenites hughesii.The palynoflora is comparable with that of the Changcai Formation of the Yanbian District of the Jilin Province of China.It is suggested that the Longpan Formation of North Korea should belong to Barremian to Aptian in age.Judging from the palynoflora,the Early Cretaceous palaeoclimate in the Anchow Basin should belong to the semi arid type of the subtropic zone.