A monograph of the molluscan fauna of the Orthaulax pugnax zone of the Oligocene of Tampa, Florida

In the vicinity of Tampa Bay, Florida, and especially on the northwestern shores of the bay, near Ballast Point, are found certain limestones more or less mingled with layers of clay, marl, and chert, with residual sands and so-called "fuller's earth." This work attempts to illustrate some of these fossil materials.