Geologic units in Saint Bernard Parish, Louisiana

Delta Plain, Saline Marsh (Holocene) at surface, covers 82 % of this area

Gray to black clay of very high organic content, some peat.

Natural Levees (Holocene) at surface, covers 12 % of this area

Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.

Alluvium (Holocene) at surface, covers 6 % of this area

Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.

Delta Plain, Fresh Marsh (Holocene) at surface, covers 0.8 % of this area

Gray to black clay of very high organic content, some peat.