User talk:Augustinayao

Mississippian The Mississippian is a sub period in the geologic timescale or a subsystem of the geologic record. It is the earliest lowermost of two sub periods of the Carboniferous period lasting from roughly 358.904to 323.204 million years ago. As with most other geochronology units, the rock beds that define the Mississippian are well identified, but the exact start and end dates are uncertain by a few million years. The Mississippian is so named because rocks with this age are exposed in the Mississippi River valley.