How To Use Silurian In A Sentence
- It is thus unlikely that the bulk of the Carboniferous detritus could have been derived by recycling of preexisting Silurian sandstones.
- Over this system lie beds which have yielded in succession Ordovician and Silurian fossils, forming altogether a compact division which has been distinguished locally as the _Muth system_. The Panjab, North-West Frontier Province, and Kashmir
- The still better known _Chondrus crispus_, the Irish moss or carrageen of our cookery-books, has likewise its apparent though more distant representative in _Chondritis_, a Lower Silurian algæ, of which there seems to exist at least three species. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed
- As to fossil representatives of the ichthyic type, the most ancient were not supposed before 1838 to be of a date anterior to the Coal, but they have since been traced back, first to the Devonian, and then to the Silurian rocks. The Antiquity of Man
- In the Middle and Late Silurian odd specializations, like lacunose septa and complex septal formations in the body chamber, develop.
- Presumably (assuming insects do derive from Crustacea) primitive hexapods evolved from marginal marine and amphibious crustaceans during the late Silurian or early Devonian.
- All around it is limestone, which anyone who has studied geography at school will know is pervious and water disappears through it, the area of the tarn lays on Silurian Slate, hence the reason for this magnificent sheet of water.
- Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks.
- But whenever I read it it calls forth for me an image that surely was nothing at all like what Eliot had in mind: that silent sea is, for me, the paleozoic one of the Cambrian or Silurian period of four hundred million years ago, and the owner of that pair of ragged claws is the curious mud-crawling creature known as a _eurypterid, _ a vaguely lobsterish thing that reached lengths of eight feet and more. Asimov's Science Fiction
- At the base of the Silurian this fauna was replaced by the monograptids, scandent forms in which the thecae were arranged along one side of the stipe only.
