Environmental Geochemistry and Sediment Quality in Lake Pontchartrain

Summary Table of Figures for Lake Pontchartrain Geologic History Field studies and background data Fig. 1 Location map for field surveys Fig. 2 Bathymetric and sediment texture Subsurface expressions of the ancestral Mississippi River Fig. 3 (a) Seismic profile (b) Channel overlain by estuarine fill Pleistocene-Holocene sediment distributions Fig. 4 Contour map of depth to Pleistocene surface Fig. 5 Generalized vibracore with typical sediment units Fig. 6 USACE boring and seismic profiles Fig. 7 High-resolution seismic profile with vibracore Fig. 8 Thinning of Holocene deposits in northern Lake Pontchartrain Schematic development of Lake Pontchartrain Fig. 9 Changes over time with sea-level rise Sediment profiles from NW Lake Pontchartrain to Lake Borgne Fig. 10 Superposition of various depositional units (marsh, estuarine/lagoonal, deltaic, etc.) Schematic development of the Northern Gulf of Mexico shelf Fig. 11 Estuary and shelf development through Holocene transgression Back to Geologic History of Lake Pontchartrain

U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/1998/of98-805/html/jk_summ.htm
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