The Rio Grande delta and Laguna Madre
The Rio Grande delta and Laguna Madre. The major Holocene coastal depocenter west of the Mississippi delta in the northwestern Gulf of Mexico is the Rio Grande delta at the Texas-State of Tamaulipas, Mexico, border, a system that began to form about 7,000 years ago. This is clearly not a delta in its constructional phase. Rather, the coastline configuration is presently being altered and cut back by strong wave-driven energy and hurricanes (average rate of one every five years).,