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The cause for the end of the Late Ordovician Glaciation is a matter of intense research, but evidence shows that the deglaciation in the terminal Hirnantian may have occurred abruptly, as Silurian strata marks a significant change from the glacial deposits left during the Late Ordovician. [66]
A "greenhouse Earth" is a period during which no continental glaciers exist anywhere on the planet. [6] Additionally, the levels of carbon dioxide and other greenhouse gases (such as water vapor and methane) are high, and sea surface temperatures (SSTs) range from 28 °C (82.4 °F) in the tropics to 0 °C (32 °F) in the polar regions. [7]
Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "Ordovician plants" The following 6 pages are in this category, out of 6 ...
In fact, the Hirnantian (also known as the End Ordovician and the Ordovician-Silurian) mass extinction event represents the second largest such event in geologic history. Approximately 85% of marine (sea-dwelling) species died. Only the End-Permian mass extinction was larger. Unlike many smaller extinction events, however, the long-term ...
Download as PDF; Printable version; ... Ordovician plants (6 P) T. Ordovician life by Linnaean taxonomic rank (3 C) This page was ...
The melting of icecaps and glaciers contributed to a rise in sea level, recognizable from the fact that Silurian sediments overlie eroded Ordovician sediments, forming an unconformity. The continents of Avalonia , Baltica , and Laurentia drifted together near the equator , starting the formation of a second supercontinent known as Euramerica .
Download as PDF; Printable version; In other projects ... First land plant spores [1] ... Ordovician meteor event [2] [3] Subdivision of the Ordovician according to ...
The first appearance datum (FAD) of Iapetognathus fluctivagus in the cliffs of Green Point, Newfoundland and Labrador, Canada is defined as the base of the Tremadocian Age (486.85 million years ago) and the beginning of the Ordovician Period.