FAS Abstracts 2004 Meeting Page

Geological & Hydrological Sciences (GHS): POS-10

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Surficial and bedrock geology of the eastern portion of the U.S.G.S 100,000 scale Marianna Quadrangle, Northwestern Florida. W.L EVANS, R.C GREEN, J.R. BRYAN and D.T PAUL.  Florida Geological Survey, 903 W. Tennessee St., Tallahassee, FL 32304  The near surface geology of the eastern half of the U.S.G.S. 1:100,000 Scale Marianna Quadrangle, is composed of Eocene to Holocene carbonate and siliciclastic sediments. The geologic processes include a combination of fluvio-deltaic and marine deposition, erosion, dolomitization, and karstification. Several structural, sedimentological, and geomorphic variables are unique to the area and have affected the near surface expression and interpretation of the geology of the region. Two important structural features are recognized: the Chattahoochee Arch – a northeast/southwest-trending high that exposes Eocene and Oligocene carbonates, with younger strata thinning around the arch; and the Apalachicola Embayment/Gulf Trough - an elongated basin that noticeably influenced sedimentation patterns in the region.