Sixth Mass Extinction:  The Holocene Extinction

The Holocene extinction is the extinction of species during the present Holocene epoch (since around 10,000 BC).  The extinction includes families of plants and animals including mammals, birds, amphibians, reptiles and arthropods.  The International Union for Conservation of Nature and Natural Resources has recorded 875 extinctions occurring since 1500 but the vast majority of extinctions are …

Continue reading Sixth Mass Extinction:  The Holocene Extinction

Advertisements

Fifth Mass Extinction: Cretaceous-Paleogene Extinction Event

The Cretaceous-Paleogene extinction event occurred 65 million years ago.  In this extinction 17% of families, 50% of all genera, and 75% of all species became extinct.  This extinction is believed to have been caused by an asteroid impact at the Chicxulub crater in the Yucatan plateau.  Before this extinction, mammals were few and small, most …

Continue reading Fifth Mass Extinction: Cretaceous-Paleogene Extinction Event

Fourth Mass Extinction: Triassic-Jurassic Extinction Event 

The Triassic-Jurassic mass extinction event occurred 205 million years ago.  During this extinction, 23% of all families, 48% of all genera went extinct and about half of the species of Earth were wiped out.  This event happened around the time period that the supercontinent Pangea began to break into continents.  Scientists believe that this extinction …

Continue reading Fourth Mass Extinction: Triassic-Jurassic Extinction Event