How To Use Silurian In A Sentence
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A similar picture is seen in the Silurian, with five communities inhabiting the same area and forming concentric belts parallel to what was then the shoreline.
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On what amount of similarity of their faunae is the doctrine of the contemporaneity of the European and of the North American Silurians based?
Lectures and Essays
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During the Late Silurian and Early Devonian, the Royal Creek area lay at the margin of a deep-water embayment.
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This was accompanied by the multistage emplacement of large intrusive bodies in the Cambrian, Ordovician, and Silurian periods.
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Darwin predicted that precursors to the trilobite would be found in pre-Silurian rocks … Similarly, Darwin predicted that Precambrian fossils would be found.
Blast From the Past
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The stratigraphic framework of the Dnestr Basin Silurian successions has been constructed from detailed lithostratigraphic and biostratigraphic studies by numerous authors.
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Eighteen analyses of detrital zircon and one of monazite were carried out for the late Silurian sandstone.
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If this occurrence of a true hexapod insect from the Middle Silurian be really established, taken in connection with the well-defined Coleoptera from the Carboniferous, the origin of the entire group of terrestrial arthropoda is necessarily thrown back into the Cambrian epoch, if not earlier.
Darwinism (1889)
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This occurred prior to a major pre-Pennsylvanian erosional interval that removed Silurian sedimentary strata from the region.
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The entire north area consists of Quaternary sediments, while the surrounding uplands are dolostone, limestone, and sandstone of upper Silurian to lower Devonian origin, plus associated till.
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Jawed vertebrates appeared 100 million years later, in the Silurian.
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Minor glaciations may also have taken place in the earlier Ordovician early Silurian and late Devonian.
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The erupted rocks which have broken through and upheaved these strata have been elevated from depths that are wholly inaccessible to our research; they must, therefore, have existed under the silurian strata, and been composed of the same association of minerals which we term granite, augite, and quartzose porphyry, when they are made known to us by eruption through the surface.
COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1
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Cruachan more to the quick, had he known all about geology, gneiss, and graywacke, and the Silurian system?
Spare Hours
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This rock unit consists chiefly of Silurian shale and sandstone that have been metamorphosed to high-grade schist and migmatite.
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No, strike that, the Silurian grayfish Phlox had swimming in his tank down in sickbay could do a better job.
Rosetta
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The bulk of underlying rocks (slates and greywacke to greenschist facies) are marine Silurian, Devonian and Carboniferous sediments of the Hodgekinson Basin and Broken River Embayment.
Wet Tropics of Queensland World Heritage Site, Australia
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The tiny conical shells known as dacryoconarids were also abundant and evolving rapidly at this time, but only a few dendroid graptoloids remained from the Silurian faunas.
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A similar picture is seen in the Silurian, with five communities inhabiting the same area and forming concentric belts parallel to what was then the shoreline.
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Related agnathans with external armour occur widely from the Late Silurian to the Devonian, but they all became extinct before the start of the Carboniferous.
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Silurian ramphoprionid polychaete annelids, represented by their jaws, are described from extensive collections from Gotland, Sweden.
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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
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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
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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
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In the Middle and Late Silurian odd specializations, like lacunose septa and complex septal formations in the body chamber, develop.
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Presumably (assuming insects do derive from Crustacea) primitive hexapods evolved from marginal marine and amphibious crustaceans during the late Silurian or early Devonian.
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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.
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Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks.
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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
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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.
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It is thus unlikely that the bulk of the Carboniferous detritus could have been derived by recycling of preexisting Silurian sandstones.
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Silurian strata have provided likely ascomycete fossils (a group of fungi), as well as remains of the first arachnids and centipedes.
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Plutonic action would be very general, and volcanic mud, ash, and sand would be ejected and spread far and wide, which, sinking to the bottom of the water, may possibly be the origin of what we now designate the azoic or metamorphic slates and schists, as also the early Cambrian and Silurian strata.
Getting Gold: a practical treatise for prospectors, miners and students
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The symmetrical, diphycercal tail, not perfected by gnathostomes until the Cretaceous, was standard equipment on heterostracans in the Silurian.
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This convergence gave rise to southward thrusting of the Yixieke forearc in Ordovician-Early Silurian time, which then led to obduction of the Buziwan ultrabasic rocks southward over the Kudi terrane.
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Related agnathans with external armour occur widely from the Late Silurian to the Devonian, but they all became extinct before the start of the Carboniferous.
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Cored by folded and faulted, interbedded Silurian sandstone, conglomerate, and quartzite.
Ecoregions of New Jersey (EPA)
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He oozes casual masculinity and in Silurians he's seen as car mechanic, a T-shirted, jeans wearing forensic scientist and a potholer whilst in Ambassadors he's a bone fide astronaut (compare him to the Troughton figure in The Seeds Of Death and you'll see how the tone has shifted).
British Blogs
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The first jawed fish in the fossil record are the acanthodians, which first occur in the Late Silurian.
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But as the ecosystem recovered after the freeze, it expanded, with land plants becoming common over the course of the Silurian period.
