| water |
| Hdp - Deposits of the Plaquemines delta lobe, Mississippi River (Holocene) |
| Hdpl - Natural levee complex of the Plaquemines delta lobe, Mississippi River (Holocene) |
| Hll - Natural levee deposits of the Lafourche meander belt (Holocene) |
| Hdl - Deposits of Lafourche delta lobe, Mississippi River (Holocene) |
| Hds - Deposits of the St. Bernard delta lobe, Mississippi River (Holocene) |
| Hdsl - Natural levee deposits of the St. Bernard delta lobe, Mississippi River (Holocene) |
| Hdsm - Meander belt of the St. Bernard delta lobe, Mississippi River (Holocene) |
| Hmm1 - Mississippi River meander belt 1 (Holocene) |
| Hml1 - Natural levee complex of Mississippi River meander belt 1 (Holocene) |
| Hmc1 - Crevasse complex of Mississippi River meander belt 1 (Holocene) |