| ![](../images/dot_clear.gif) | ![](../images/669corner-ul.gif) | Lake Pontchartrain Atlas: | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | Basin Geology | ![You are at the Basin Geology section of the Environmental Atlas of Lake Pontchartrain](../images/pointer.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | ![](../images/dot_clear.gif) | | ![](../images/669corner-ll.gif) | | ![](../images/dot_clear.gif) | | ![](../images/dot_clear.gif) | ![](../images/dot_clear.gif) | ![](../images/dot_clear.gif) | | | ![](../images/spacer.gif) | Basin Geology - Geomorphology Contributors: Beall, Zganjar, Westphal, Penland ![Location map for Lake Borgne.](images/pg62fig1.gif) | Figure 49: Location map for Lake Borgne. | Legend | ![pink bar](images/brightyellowbar.gif) | Shell Beach A beach of high relief made up predominately of shell. | ![pink bar](images/yellowbar.gif) | Sand Beach A beach made up of fine or coarse grain sand. | ![pink bar](images/brightgreenbar.gif) | Brackish Marsh Any unforested, vegetated area normally subject to inundation or tidal action at any time sufficient to support wetland-development, emergent vegetation with salinity between 8-16 ppt. | ![pink bar](images/mintgreenbar.gif) | Salt Marsh Any unforested, vegetated area normally subject to inundation or tidal action at any time sufficient to support wetland-development, emergent vegetation with salinity between 16-40 ppt. | ![pink bar](images/pinkbar.gif) | Riprap Armor Embankment or revetment along a shoreline reinforced by things thrown together without order in the form of broken concrete, concrete blocks, old pilings, rubble, etc. to resist erosion. | ![red bar](images/redbar.gif) | Bulkhead A wood, steel, or concrete wall along a waterfront. Can be adjacent to the land as a retaining wall or separate from it as a seawall to provide wave protection and resist erosion. | | | Figure 50: Shoreline types of Lake Borgne. (Click on a letter to see a photograph of the shoreline.) | « Previous | Next » |