RECORDS OF COOKSONIA-TYPE SPORANGIA FROM LATE WENLOCK STRATA IN IRELAND
RECORDS OF COOKSONIA-TYPE SPORANGIA FROM LATE WENLOCK STRATA IN IRELAND
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DOI：
10.1038/287041a0
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发表时间：
1980-01-01
期刊：
影响因子：
64.8
通讯作者：
FEEHAN, J
中科院分区：
文献类型：
--
作者：
EDWARDS, D;FEEHAN, J
迄今为止，含有cooksonitype孢子体的化石植物群的最早记录来自威尔士的勒德洛（志留纪）中部地区1。图1-4所示的压缩化石来自文洛克系列最高笔石带的地层，其特征为ludmonograptus ensis。它们是（由j.f.）在爱尔兰蒂珀雷里郡的魔鬼山地区收集的。但这不仅仅是一个延伸到下泥盆纪末期的属的首次出现的记录，因为库克索尼亚通常被认为是一种维管植物2。因此，它在温洛克河顶部的出现似乎将维管植物的历史追溯到志留纪中期，并表明高等植物至少在415万年前就占领了陆地表面。
Hitherto the earliest record of a fossil flora containingCooksoniatype sporangia was from a mid-Ludlow (Silurian) locality in Wales1. The compression fossils illustrated here (Figs 1–4) come from strata assigned to the highest graptolite zone of the Wenlock Series characterized byMonograptus ludensis. They were collected (by J. F.) in the Devilsbit Mountain district of County Tipperary, Ireland. But this is not just a record of the first appearance of a genus which extends to the end of the Lower Devonian, becauseCooksoniahas generally been accepted as a vascular plant2. Its occurrence at the top of the Wenlock therefore seems to extend the history of vascular plants back to the middle of the Silurian and to indicate that higher plants colonized land surfaces at least 415 Myr ago.