Browse Items · Mississippi State University Libraries

Signature of Cicero Mitchell

Signature of Cicero Mitchell, from an 1871 letter to Governor Alcorn.

This chart shows the way geologic time is broken down into smaller spans of time called Eons, Eras, Periods, and Epochs. The top of the chart is current time, labeled as 0 Ma (0 years before present). The bottom of the chart represents the beginning…

Map of North America during the Cretaceous showing the Western Interior Seaway and the Mississippi Embayment.

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This map shows which parts of North America were inundated with water during the Cretaceous Period.

Tags: Cretaceous, mississippi embayment, seaway, western interior seaway

Exogyra costata (Say 1871) showing damage to growth lines.

Exogyra costata are commonly found in the Cretaceous strata in northeast Mississippi. This example from the Dunn-Seiler Museum shows damage to the growth lines that were repaired as the creature grew.