2-mile (3.2 km) diameter bolide creates 90-km Chesapeake Bay impact crater in America. Africa/Arabia collides with Eurasia, end of Tethys Sea. First deinotheres, similar to an elephant but with tusks on lower jaw. Mid-Miocene Climatic Optimum, Middle Miocene disruption. First Thylacosmilus, sabre-toothed marsupial of South America.
"Toumaï", of species Sahelanthropus tchadensis, shows some human traits. Possible time of Isthmus of Panama connecting South and Central America. Lucy, member of the species Australopithecus afarensis.
Prototaxites, tree-like organism, probably a fungus or lichen. First amphibians, archaeopteris (tree ferns), seeds, coelacanths.
Gymnosperms (especially conifers, Bennettitales, and cycads) and ferns common.
Not everything over there is fully functional yet, and the internal links still point to this blog, and will for the indefinite future.