The most complete series of Neozoic rocks in continuous succession which has yet been observed on the Gulf coast is that which is exhibited in the natural sections exposed in the bluffs of the Flint and Apalachicola rivers, in southwestern Georgia and western Florida. For this reason the series has been adopted in various publications* as a standard by which to correlate the different Neocene beds of this general region. The longest continuous series of beds in one section is exposed at Alum bluff, in township 8, range 1 north, section 24, Liberty county, Florida. Attention was first called to this series by Mr D. W. Langdon in 1889,† from observations made two years earlier. At the suggestion of Mr T. H. Aldrich, who had identified Langdon’s fossils, and, in cooperation with him, Mr Frank Burns, of the United States Geological Survey, was sent to Alum bluff in . . .