东北地区早白垩世植物群组合序列及时代

Assemblages of the Early Cretaceous Flora in Northeast China.

将中国东北地区早白垩世的植物群划分为５个组合，由早到晚为：Ｏｎｙｃｈｉｏｐｓｉｓ－Ｇｉｎｋｇｏｓｉｂｉｒｉｃａ组合，代表层位为冀北地区和辽西地区的九佛堂组；Ａｃａｎｔｈｏｐｔｅｒｉｓ－Ｇｉｎｋｇｏｃｏｒｉａｃｅａ组合，代表层位为霍林河盆地霍林河组下含煤段和海拉尔盆地大磨拐河组；ＲｕｆｆｏｒｄｉａＤｒｙｏｐｔｅｒｉｔｅｓ组合，代表层位为阜新盆地阜新组（水泉段除外）等；Ｃｔｅｎｉｓｌｙｒａｔａ－Ｃｈｉｌｉｎｉａ组合，代表层位为阜新盆地阜新组水泉段、蛟河盆地杉松组；早期被子植物组合，代表层位为延吉盆地大拉子组和松辽盆地泉头组。各组合的地质时期为：梁赞期到凡兰吟期，凡兰吟期至欧特里夫早期，欧特里夫晚期至巴雷姆期，阿普特期至阿尔比早期，阿尔比中、晚期。参２８（梁大新摘）

The Early Cretaceous Flora in Northeast China is composed of 5 assemblages as followings. (1)Onychiopsis Ginkgo sibirica Assemblage: This assemblage is yielded in the Jiufotang Formation of western Liaoning and northern Hebei. It consists of about 30 species including many species of the Filicopsida, Ginkgopsida, Coniferopsida and a few of Cycadopsida. The age of this assemblage is considered as Ryazanian Valanginian of Early Cretaceous. (2) Acanthopteris Ginkgo coriacea Assemblage: The representative plant fossil bearing beds are the lower part of the Huolinhe Formation, Huolinhe basin and the Damoguahe Formation of the Hailar basin, Inner Mongolia. This assemblage is totally composed of about 100 species, representing the developing stage of the flora. Filicopsida is dominant and of which Dicksoniaceae is abundant. Cycadopsida, Ginkgopsida and Coniferopsida are almost equal to each other in variety of species. Ginkgo coriacea dominates the Gymnosperm group. The age of this assemblage is probably Valanginian Early Hauterivian.(3) Ruffordia Dryopterites Assemblage: This assemblage represents the flourishing stage of the flora and consists of about 150 species. The main fossil bearing beds are the Fuxin Formation (excluding the upper most Shuiquan Member), Fuxin basin, Liaoning and the Yimin Formation of the Hailar basin, Inner Mongolia. Ferns and conifers dominate the assemblage, Ginkgopsida and Cycadopsida occupy the similar positions. Dicksoniaceae are flourishing both in number of individuals and variety of species and monolete spore ferns reach a greatest development. Ruffordia goepperti frequently occurs. Pterophyllum, Nilssoniopteris, Nilssonia and Ctenis of Cycadopsida; Ginkgo, Sphenobaiera, Baiera and Phoenicopsis of Ginkgopsida and Cunninghamia, Taxus, Torreya, Sequoia, Athrotaxites, Cephalotaxopsis, Elatides of Conifer opsida are common. Some early Angiosperms such as Asiatifolium, Jixia and Rogersia are also present. The age of this assemblage is late Huaterivan Barremian. (4) Ctenis lyrata Chilinia Assemblage: The fossil bearing beds are the Shuiquan Member of the Fuxin Formation, Fuxin basin and the Shansong Formation, Jiaohe basin. It consists of about 60 species and is dominated by Cycadopsida and Coniferopsida. Ginkgopsida and Filicopsida are quite few in species. Some Angiosperms such as Vitiphyllum sp., Phyllites sp. occur as well. The age of this assemblage is considered as Aptian early Albian. (5) Early Angiosperm Assemblage: This assemblage is contained in the Dalazi Formation of Yanji basin and the Quantou Formation of Songliao basin. Angiosperms dominate the assemblage. This assemblage may be middle to late Albian in age.