Permian Mass Extinction essays

Permian Mass Extinction essays A mass extinction about 250 million years ago, which destroyed almost of the species on Earth, happened very quickly and it is demonstrated in the fossil record by the collapse of one-celled organisms called protests. Something suddenly killed off more than 90 %of all species on earth, and that led to the age of the dinosaurs. Evidence indicates the massive die-off was linked with an abrupt drop in productivity, the rate at which inorganic carbon is turned into organic carbon through processes such as photosynthesis. Terrestrial faunal diversification occurred in the Permian and 90-95% of marine species became extinct. Among terrestrial fauna affected included insects, amphibians, reptiles and mammal-like reptiles. The terrestrial flora was predominately composed of gymnosperms, including conifers. Life in the sea consisted of common groups of brachiopods, bony fish, sharks and fuslinid. Corals and trilobites were also present, but were exceedingly rare. During the Permian period all the worlds land masses joined together into a single super continent named Pangaea. The collision between Laurasia and Siberia-Kazakhstania and China finalized and assembled into Pangaea by the end of Permian. This was the first time since the late Protrusion super continent of Rodina that such a landmass had formed. Pangea was shaped sort of like a giant pacman with the mouth on the east. There was a corresponding large single ocean, called Pathalassa. The body of water enclosed by the pacman mouth constituted a smaller area, the Tethys, which covered much of what is now southern and central Europe. Throughout the Permian, Europe was covered by a very salty inland sea, the Zechstein Sea, which advanced and receded at least twice. This was home to an impoverished fauna, mainly brachiopods and bivalves, which were able to cope with the hyper saline conditions. ...