作　　者： ; ; ; ; ; ;

机构地区： 沈阳地质矿产研究所

出　　处： 《地层学杂志》 2006年第1期26-33,共8页

摘　　要： 扎赉特旗德发屯地区的木化石原定为PhoroxylonmultiforiumZheng&Zhang,现修订为Scalaroxylonmultiforium(Zheng&Zhang)Zhang&Zhengcomb.nov.,Scalaroxylon迄今仅见于德国南部的晚三叠世沉积中。根据区域地层对比,含木化石的地层是一套红杂色陆相沉积,其地层层序、岩性、岩相特征与邻区的下三叠统老龙头组完全可以进行对比,含木化石的地层层位应为下三叠统老龙头组,而不是“上侏罗统”大磨拐河组。根据这一研究结果,对大兴安岭中部地区的下三叠统老龙头组及哈达陶勒盖组进行了较详细的讨论和对比。 The former Phoroxylon multiforium Zheng ＆ Zhang （1980） from the Defatun area, Jalaid Qi, Inner Mongolia, has been redetermined by the authors as Scalaroxylon multiforium （Zheng ＆ Zhang） Zhang ＆ Zheng comb. nov.. On the basis of this redetermination, the authors consider that the fossil wood-bearing beds should not belong to the Lower Cretaceous Damoguaihe Formation and must be removed to the Lower Triassic Laolongtou Formation. The ascription of Early Triassic to the fossil woodbearing beds is partly based on the stratigraphical position, and rather securely on the age of the genus Scalaroxylon which so far is only reported from the Late Triassic of Franken Keuper （Southern Germany） （Vogellehner 1967）. The well exposed outcrop of the strata yielding the fossil woods in the Defatun area are discussed here （Fig. 1）. They are composed largely of purplish conglomerate rocks, mottled sandstones and yellowish-green argillaceous siltstones and slightly metamorphosed, and not including coals. They may be correlated closely with the Laolongtou Formation in the area to the west of Longjiang County, Heilongjiang Province and the Hadatoulegai Formation in the Solon areas, Ulanhot City, Inner Mongolia.

关 键 词： 扎赉特旗 内蒙古 下三叠统 老龙头组 哈达陶勒盖组 木化石 地层对比

领　　域： [天文地球] [天文地球]