Part 1 involves a resume of Simpson research during the period 1902 to 1956. Supplementing the resume are text figures depicting stratigraphy, lithology, and correlation of the Simpson group.
The establishment, type section, thickness, lithology, relationship, age, correlation, and Ostracoda of each of the five standard formations of the Simpson group (Joins, Oil Creek, McLish, Tulip Creek, and Bromide) are discussed in detail. A new topmost Simpson formation, the Corbin Ranch, is proposed and discussed in Part 1.
In Part 2 the habitat and anatomy of living Ostracoda are discussed, as well as the structure, shape, surface, orientation, and classification of the living and fossil ostracodal carapace.
Eleven families, 42 genera, 116 species, nine subspecies, and one variety of Ostracoda are described and illustrated; their stratigraphic ranges are noted through four type Simpson sections of the Arbuckle Mountains and Criner Hills of Oklahoma.
Four ostracodal range charts of four type Simpson sections portray thickness, lithology, numbered zones, and formational
contacts in the sections, as well as occurrence and range of the Ostracoda therein. An additional General Range Chart, compiled from analyses of the aforementioned four separate charts, presents comparative, geologic ranges of the Simpson Ostracoda through the four type Simpson sections, and notes in separate columns the occurrence of certain species in miscellaneous wells and outcrops.
The publication includes a brief summary, as well as selected bibliographic references for both Simpson stratigraphy and Simpson Ostracoda.