Search results
Results From The WOW.Com Content Network
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]
Recently, fossils of plant sporangia have been found in Oman with cryptospores showing concentric lamellae in their walls, similar to liverworts.The earliest known cryptospores are from Middle Ordovician strata of Argentina. [3]
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 ...
The papyrus scrolls found in a Herculaneum villa in the 1750s were badly charred by the eruption of Mount Vesuvius in A.D. 79. Since their discovery in the 1700s, researchers have tried many ...
For premium support please call: 800-290-4726 more ways to reach us
For premium support please call: 800-290-4726 more ways to reach us
First, the cooling global climate was probably especially detrimental because the biota were adapted to an intense greenhouse, especially because most shallow sea habitats in the Ordovician were located in the tropics. [62] The southward shift of the polar front severely contracted the available latitudinal range of warm-adapted organisms. [63]
Which Southern California native plants survived climate change and mass extinctions 13,000 years ago and still live today? La Brea Tar Pits researchers compiled a list. 57 California native ...