Silurian period - significado y definición. Qué es Silurian period
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Qué (quién) es Silurian period - definición

THIRD PERIOD OF THE PALEOZOIC ERA
Silurian period; Silurian Period; Rhuddalian; Silurian era; Silurian Era; Late Silurian; Lower Silurian; Upper Silurian; Silurian system; Silurian System; Silurian climate; Ontarian stage; Pridolian; Silur (geology); Silur era; Sirulian; Sirulian period; Climate of the Silurian
  • Fossils of the late Silurian sea bed

Silurian         
·noun The Silurian age.
II. Silurian ·adj Of or pertaining to the country of the ancient Silures;
- a term applied to the earliest of the Paleozoic eras, and also to the strata of the era, because most plainly developed in that country.
Silurian         
[s??'lj??r??n, s?-]
¦ adjective Geology relating to or denoting the third period of the Palaeozoic era (between the Ordovician and Devonian periods, about 439-409 million years ago), a time when land plants and the first true fish appeared.
Origin
C18: from Silures, the L. name of a people of ancient SE Wales + -ian.
Infectious period         
  • latent period]], the infectious period (the period of communicability) and the [[incubation period]]. In some diseases, as depicted in this diagram, the latent period is shorter than the incubation period. A person can transmit an infection without showing any signs of the disease. Such an infection is called a [[subclinical infection]].
TIME INTERVAL DURING WHICH A HOST (INDIVIDUAL OR PATIENT) IS INFECTIOUS, I.E. CAPABLE OF DIRECTLY OR INDIRECTLY TRANSMITTING PATHOGENS TO ANOTHER SUSCEPTIBLE HOST
Infective period; Period of communicability; Period of infectiousness; Communicability period; Contagious period; Period of contagiousness; Transmission period; Transmissibility period
In epidemiology, particularly in the discussion of infectious disease dynamics (mathematical modeling of disease spread), the infectious period is the time interval during which a host (individual or patient) is infectious, i.e.

Wikipedia

Silurian

The Silurian ( sih-LYOOR-ee-ən, sy-) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago (Mya), to the beginning of the Devonian Period, 419.2 Mya. The Silurian is the shortest period of the Paleozoic Era. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out.

One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods (myriapods, arachnids and hexapods) became fully terrestrialized.

A significant evolutionary milestone during the Silurian was the diversification of jawed fish and bony fish.