On Fossil Remains in the Cambrian Rocks of the Longmynd and North Wales
On Fossil Remains in the Cambrian Rocks of the Longmynd and North Wales
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论朗米德和北威尔士寒武纪岩石中的化石遗迹
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通讯作者：
J. Salter
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作者：
J. Salter
在那些常被称为无生界的古代沉积物中出现的任何生物，都足以引起社会的兴趣。到目前为止，我们只知道爱尔兰寒武纪最古老的片岩中有一个属--它是动物还是植物，这是值得怀疑的。除了我现在描述的形式之外，英国没有记录到来自这个时代岩石的化石，并且在英国协会的最后一次会议上发出了简短的通知。它们是一种新的海藻，或称植虫，是海生蠕虫的痕迹，也是一种属于三叶虫类的甲壳动物。几年前，当我和拉姆齐教授、艾弗林先生横渡朗明德河时，东边大量的未改变的、平坦的砂岩，它们完全没有受到卵裂的影响，如果在这些岩石沉积的时候存在任何生物的话，它们似乎最有希望成为化石遗迹。其中一些河床上有波纹，砂岩和灰绿色的石板床显然不是很深的水的沉积物。我希望，因此，至少可以在其中找到Oldhamia或Fucoids，如果不是更高度组织化的化石;在去年夏天，我能够花三到四个星期进行搜索。
The occurrence of any organism in those ancient sediments which have been so often called Azoic is of sufficient interest for an account of it to be laid before the Society. We have hitherto been acquainted with but one genus—and that doubtfully an animal or a plant—in the oldest Cambrian schists of Ireland. No fossils from rocks of this age have been recorded from England except the forms which I now describe, and of which a brief notice was sent to the last meeting of the British Association. They are a new Sea-weed, or Zoophyte, traces of marine worms, and a Crustacean of the Trilobite group. When, a few years back, I crossed the Longmynd with Prof. Ramsay and Mr. Aveline, the unaltered and flat-bedded sandstones which abound on the eastern side, and which are quite unaffected by cleavage, appeared most promising for fossil remains, if any organisms existed at the time when these rocks were deposited. Some of these beds were ripple-marked, and the sandstones and flaggy beds of greenish-grey stone were evidently not deposits from very deep water. I hoped, therefore, that at least Oldhamia or Fucoids might be found in them, if not more highly organized fossils; and in the summer of the past year, I was able to devote three or four weeks to the search.