金原篦羽叶Ctenis kaneharai Yokoyama最完整叶部化石的发现

概要报道产于辽西北票市常河营乡长垅地沟村东山中侏罗统海房沟组中一种大型苏铁类叶部化石——金原篦羽叶Ctenis kaneharai Yokoyama.这种化石最早被报道于辽宁东部凤城县赛马集碾子沟中侏罗统大堡组，后来在日本和英国也被发现.但是，以往发表的该种所有材料都是些植物叶部断片标本，对它的全貌并不了解.在本文中报道的该种标本，不仅数量多而且保存得特别完整.可以说，这是迄今在我国辽西中侏罗世燕辽植物群中大型苏铁类保存最完整叶部化石的又一次重要发现.它为正确了解我国燕辽植物群的性质，苏铁类的整体形态特征和古气候状况分析，提供了更为可靠的化石依据.

DISCOVERY OF THE MOST COMPLETE FOSSIL LEAVES OF Ctenis kaneharai Yokoyama

Some recently discovered fossil leaves of cycad(Ctenis kaneharai Yokoyama) from the Middle Jurassic Haifanggou Formation in Changlongdigou,Beipiao,Western Liaoning Province are summarily reported.This species of fossil plant was firstly described by Japanese researcher Yokoyama from the Middle Jurassic Dabao Formation of Nianzigou,Fengcheng,Eastern Liaoning.Later on,it was also found in Japan and England.However,all the previously reported specimens are some fragments of the fossil plant,so that people could not know the complete picture of the plant.The specimens reported in this paper are not only plenty in number,but also conserved intact.Undoubtedly,these fossil plants are the best conserved so far for this genus in the Middle Jurassic Yanliao Flora.The present discovery of these specimens is significantly important for the paleoecology,paleoclimatology and other researches on the Yanliao Flora in China.