Author	Gohn, G.S., Brewster-Wingard, G.L., Cronin, T.M., Edwards, L.E., Gibson, T.G., Rub
Year	1996
Journal	U.S. Geological Survey, Open-file Report 96-20A, preliminary.U.S. Geological Survey, Open-file Repo
Title	Neogene and Quaternary geology of a stratigraphic test hole on Horn Island, Mississipi Sound.

Abstract Gohn, G.S., Brewster-Wingard, G.L., Cronin, T.M., Edwards, L.E., Gibson, T.G., Rubin, M. and Willard, D.A., 1996. Neogene and Quaternary geology of a stratigraphic test hole on Horn Island, Mississipi Sound. U.S. Geological Survey, Open-file Report 96-20A, preliminary. SUMMARY The USGS Horn Island core presents a highly selective record of Pliocene and Quaternary sedimentation at the margin between Mississippi Sound and the northern Gulf of Mexico. Units 1 and 2 in the core are sequences of Pliocene or probable Pliocene fluvial to estuarine sediments that likely represent valley-fill sedimentation during periods of low to rising sea level. The late Pleistocene highstand marine and coastal deposits (Gulfport and Biloxi Formations and related deposits) that are widespread along the mainland coast of Mississippi (Otvos and Howett, 1992) are absent on Horn Island, at least at the USGS drill site. Unit 3 consists of a fairly complete sedimentary record of Holocene sea-level rise and the migration of Horn Island to its present position at the seaward margin of Mississippi Sound.