The details of the correlations are in papers on microfossils, probably not of great interest to much of the list and not right at hand for me, either.  However, recent papers on the molluscan faunas, such as the more recent papers (mid-1980's to 1990's) by Dockery (mostly Mississippi Geological Survey) and Hansen (various publications), cite the microfossil results in discussing the age of the mollusks.  The Bartonian-Priabonian boundary is within the Yazoo Formation (or group, depending on your classification), and the Priabonian-Ruppelian boundary is just below the top of the Yazoo.

In general, workers on Paleogene mollusks in the southeastern U.S. have been slow to pick up on revised correlations based on other taxonomic groups.

Dockery has some very well-illustrated papers on the fossil molluscan faunas of Mississippi that would appeal to anyone on the list interested in fossil mollusks, some still available from the Mississippi Geological Survey fairly cheaply.

    Dr. David Campbell
    "Old Seashells"
    Biology Department
    Saint Mary's College of Maryland
    18952 E. Fisher Road
    St. Mary's City, MD  20686-3001 USA
    [log in to unmask], 301 862-0372 Fax: 301 862-0996
"Mollusks murmured 'Morning!'.  And salmon chanted 'Evening!'."-Frank Muir, Oh My Word!