Silurian in a sentence

During the Silurian, Gondwana continued a slow southward drift to high southern latitudes, but there is evidence that the Silurian icecaps were less extensive than those of the late Ordovician glaciation.

Early in the Silurian, glaciers retreated back into the South Pole until they almost disappeared in the middle of Silurian.

This is considered the first mass extinction and the second deadliest extinction in the history of Earth. citation Silurian main The Silurian spans from 440 million years to 415 million years ago.

Vastra, a Silurian detective, and her wife, Flint, were part of the Paternoster Gang, along with the Sontaran Strax (Dan Starkey).

Around 420 million years ago, a devastating mass extinction event, known as Lau/Kozlowskii extinction, wiped around 23 per cent of all marine animals from the Earth in the late prehistoric Silurian Period.

In 2013, Klingler founded Marine City-based Klingler Automatic Industries, a brokerage of oil and gas leases focused on the Silurian Basin in southeast Michigan.

It was found that rocks were deposited in five major geological periods – the Carboniferous, Devonian, Silurian, Ordovician and Cambrian eras.

A new exceptionally preserved biota from the Lower Silurian of Wisconsin, USA.

A new synziphosurine (Chelicerata: Xiphosura) from the Late Llandovery (Silurian) Waukesha Lagerstatte, Wisconsin, USA.

As it was first identified, the "Silurian" series when traced farther afield quickly came to overlap Sedgwick's "Cambrian" sequence, however, provoking furious disagreements that ended the friendship.

Bands on the walls of tubes, in fact apparent from the early Silurian onwards, citation are an early improvisation to aid the easy flow of water.

During the early Silurian, they developed specialized cells, which were lignified (or bore similar chemical compounds) to avoid implosion; this process coincided with cell death, allowing their innards to be emptied and water to be passed through them.

During the Silurian, CO 2 was readily available, so little water needed expending to acquire it.

Fossil plants with anatomically preserved xylem are known from the Silurian (more than 400 million years ago), and trace fossils resembling individual xylem cells may be found in earlier Ordovician rocks.

Fossils of this plant are only found in Australia. citation Eohostimella heathana is an early, probably terrestrial, "plant" known from compression fossils citation of early Silurian (Llandovery) age.

He divided the Silurian rocks of Bohemia into eight stages.

Immediately below the hard-rock formation, comprising about two thirds of the cliff, lay the weaker, softer, sloping Rochester Formation (Lower Silurian).

Lapworth, recognizing that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, realized that they should be placed in a period of their own.

One species is known from each of the Ordovician and Silurian periods, citation with a few more known from the Carboniferous (Mazon Creek) — this represents the paucity of exceptional lagerstatten in post-Cambrian deposits.

Perturbations The climate and carbon cycle appears to be rather unsettled during the Silurian, which has a higher concentration of isotopic excursions than any other period.