A study based on 2 samples of the Marianna limestone from Little Slave Creek, Clarke County. One sample is from the Limestone member and the other from the Mint Spring member. The entire foraminiferal population was studied in order to establish the relationship of the microforaminifera to the other Foraminifera present in each sample. Measurements made on series of Foraminifera ranging in size from 60 to 800 microns indicate the lack of a natural size boundary for the microforaminifera group. Identifications of microforaminifera, where possible, were based on comparisons with Foraminifera of larger size. Most microforaminifera are believed to be megalospheric forms. Some microforaminifera are not sufficiently differentiated in coiling or distinctive in test character, to permit identification with established genera or species. The lithology and microfossil assemblage of the 2 samples suggest deposition of the Marianna limestone in clear, calm, lower-neritic waters.