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晚第三纪武汉地区的化石木对当地古气侯的指相

THE LATE TERTIARY CLIMATE IN WUHAN AREA RECOGNIZED BY FOSSIL WOODS

  • 摘要: 研究了我国地质年代为晚第三纪(距今2000~250万年),地理位置在湖北省武汉市新洲县阳逻镇22个树种的化石木,其中裸子植物7种,被子植物15种。中国被子植物化石木是笔者1987年首次发掘和鉴定的。武汉地区发掘的这15种均是热带或亚热带的被子植物,特别是苏木科的顶果本(Acrocarpus fraxiniforlius Arr ex Wight)、碟形花科的海南红豆(Ormosia Pinnta Merr.)和大戟科的秋枫(Bischofia javanica BI.)更是武汉地区今日未见的典型热带阔叶树种。树本一旦以化石本的形式保留下来,无疑将是当时当地地质历史时期古气候的最好指示物。根据这些化石木的存在和现代树种分布的生长条件及树种演化,有力地证明了武汉地区晚第三纪当地的古气候比今日炎热和潮湿得多.

     

    Abstract: Twenty-two species(7 gymnosperm and 15 angiosperm)of fossil woods excavated from northern part of Yanglou Town,Xinzhou County,the City of Wuhan,Hubei Province were studied. The angiosperm fossil woods foers discovered and identified asthe first record in China. These 15 angiosperm species are modernly distributed in tropical or suptropical zone. Among them, Bischofia polycarpa Airy-Shaw of the Euphorbiaceae,Acrocarpus fraxinifolius Arn. ex Wight of Caesalpiniaceae and Ormosia pinnata Merr. of Papilionaceae are distributed in tropics and have disappeared in Wuhan area atpresent. It is strongly proved that the climate in Wuhan area was more scorching and humid at the ancient times than it is at the modern times.

     

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