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作 者 ：李承森

期 刊 ：植物学通报 2000年 17卷 专辑期 页码：1-10

关键词：武汉；泥盆纪；植物；地层；

摘 要 ：本文详细介绍了湖北省武汉市郊区米粮山泥盆系地层剖面的层序和剖面上所产植物的研究进展。米粮山剖面主要由下部的石英岩和上部的泥岩组成。整套地层曾被称作珞咖石英砂岩、珞珈群或五通群（五通组）。新的岩石地层单位为云台观组（相当该剖面的下部）和黄家磴组（相当该剖面的上部）。米粮山剖面产有斜方薄皮木，其反映的地质时代是晚泥盆世。该剖面的下部（云台观组）产有泥盆原蕨、异囊小木蕨和湖北仙籽，丰富的孢子和古蝎类——小跗节湖北蝎，其地质时代为晚泥盆世早期。该剖面的上部（黄家磴组）产有圆印木，亚鳞木和楔叶等，其地质时代为晚泥盆世晚期。长江上游的云台观组的地质时代为中泥盆世晚期，黄家磴组的地质时代为晚泥盆世早期；而长江中游云台马组却是晚泥盆世早期，黄家硷组是易学尼盆世晚期。这样，从长江上游到长江中游的武汉地区，云台观组和黄家磴组都是有明显的穿时性。

Abstract:Stratigraphic sequences of a Devonian section in Miliangshan, Wuhan district of Hubei Province and Devonian plants collected from this section are introduced in this paper. The stratum is composed of quartzitic sandstone in the lower part of the section and mudstone in the upper part in lithology. This stratum was named as Luojia Quartz-sandstone, Luojia Group, Wutong Group or Wutong Formation. The new lithostratic names for this stratum are Yuntaguan Formation for the lower part of this section and Huangjiadeng Formation for the upper part of this section. Leptophloem rhombicum, Protopteridophyton devonicum Li et Hsue 1987, Chamaedendron multisporangiatum Schweitzer et Li 1996, Sphinxia wuhania Li, Hilton et Hemsley 1997 and abundant kinds of spores as well as Hubeiscopio gracilitarus Walossek, Li et Brauckmann 1990 were collected from the lower part of the section. Based on these fossils, it is early Late Devonian in age. Leptophloem rhombicum, Cyclostigma kiltorkense, Sublepidodendron wusihense, Sphenophyllum sp. were found from the upper part of this section and it is late Late Devonian in age. In the area of upper river of Yangtse, Yuntaguan Formation is late Midle Devonian and Huangjiadeng Formation is early Late Devonian in ages. But in the area of middle river of Yangtse, Yuntaguan Formation is early Late Devonian and Huangjiadeng Formation is late Late Devonia in ages. So both Yuntaguan Formation and Huangjiadeng Formation are time-transgressive.

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