- Mass extinction or biotic crisis
- Widespread and rapid decrease in the biodiversity on Earth
- The event is identified by a sharp change in the diversity and abundance of multicellular organisms or life It
- Occurs when the rate of extinction increases with respect to the rate of speciation.
- Fossil records show the background rate of extinctions on Earth is about two to five taxonomic families of marine animals every million years.
- Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land animals
- Denoting the last period of the Paleozoic era, between the Carboniferous and Triassic periods
- The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison
- Named it after the city of Perm
- Mass extinctions have sometimes accelerated the evolution of life on Earth
- When dominance of particular ecological niches passes from one group of organisms to another, a group that is “superior” to the old emerges
- Extinction events primarily eliminates old dominant groups that are inferior and makes way for the new one
Dodging the bullet
- an expression meaning to escape an unfortunate fate