| 单词 | Silurian period |
| 例句 | This compelling fact is used as evidence that non-vascular plants must have preceded the Silurian period. Fundamentals of Biology 2015-01-01T00:00:00Z This fact is used as evidence that nonvascular plants must have preceded the Silurian period. Concepts of Biology 2013-04-25T00:00:00Z The fossils date back to the Silurian period, an important era for life on earth from 443 million years ago to 419 million years ago. Fish fossil catch from China includes oldest teeth ever 2022-09-28T04:00:00Z About 420 million years ago, near the end of the so-called Silurian period, the last of a series of mass extinctions struck the world’s oceans. Death metal in ancient oceans 2015-08-25T04:00:00Z If this being so simple existed at the epoch which geologists term the Silurian period, it is many millions of ages past. The Catholic World; Volume I, Issues 1-6 A Monthly Eclectic Magazine 2012-04-05T02:00:40.207Z It is probable that these discoveries represent merely a small proportion of the plants actually existing in the Silurian period. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z Next in age after the Laurentian Highlands come the mountains of New England and the maritime province of Canada, which were upraised at the close of the Silurian period. North America 2011-05-05T02:00:20.027Z It was raised at the close of the Silurian period. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 8 "Ethiopia" to "Evangelical Association" 2011-03-05T03:00:24.537Z They belong entirely to the Ordovician and Silurian periods; they have yielded few fossils, and much work remains to be done upon them before the stratigraphical subdivisions can be clearly defined. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" The articulata of the Silurian period bore a still more peculiar character. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed He considers the first insect to have appeared after the Silurian period, viz., in the Devonian. Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses Since the immeasurably remote Silurian period, sharks and dog-fish have probably remained without any essential changes of condition, and consequently without any essential changes of structure, down to the present day. Text Book of Biology, Part 1: Vertebrata Perhaps we are the trilobites of a new Silurian period; well, trilobites were painfully common, but we need not be. The Master-Knot of Human Fate In the Silurian period in which the peopling of the seas went on apace, there was the first known attempt at colonising the dry land. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told It was quite natural that I should expect to find these signs, for during the Silurian period the seas contained no fewer than fifteen hundred different animal and vegetable species. A Journey to the Centre of the Earth The vertebrates first make their appearance, in the shape of fishes, towards the close of the Silurian period, the second of the great geological epochs. Falling in Love With Other Essays on More Exact Branches of Science We first find many certain evidences of life in the rocks which lie on top of the arch�an rock, and are known as the Cambriani and Silurian periods. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky Similarly, the species and genera which we now regard as characteristic of the Lower Silurian, may at some future time be found to have survived into the Upper Silurian period. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Even Pictet, in the second edition of his Paleontology, still considers Pleurotomaria as extinct, and as belonging to the fossiliferous formations which extend from the Silurian period to the Tertiary. Louis Agassiz: His Life and Correspondence During the Silurian period the Mississippi valley region was covered with a quiet, shallow, limestone-making sea, which received little waste from the low lands which bordered it. The Elements of Geology Nevertheless, these greenstones appear to belong, like the lavas, to the Lower Silurian period. The Student's Elements of Geology The life of the Cambrian, though not so rich as in the succeeding Silurian period, nevertheless consists of representatives of most of the great classes of invertebrate animals. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science As regards the life of the Upper Silurian period, we have, as before, a number of so-called "Fucoids," the true vegetable nature of which is in many instances beyond doubt. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Page 97 Of the life of the Lower Silurian period we have record in a vast number of fossils, showing that the seas of this period were abundantly furnished with living denizens. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The predominance of bivalve mollusca of this peculiar class has caused the Silurian period to be sometimes styled "the age of brachiopods." The Student's Elements of Geology |
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