Faunal Zones in the Standard Mississippian Section

Abstract

The standard Mississippian section is that exhibited in the Mississippi Valley, exposed in Iowa, Illinois, and Missouri. In this section there are recognized a series of more or less distinct faunal zones which have been observed to have considerable geographic distribution. These zones are denned, the leading features of their faunas are mentioned, and their known geographic distribution is shown, with the belief that the facts presented may assist in the wider correlation of the Mississippian formations and faunas.