Fruitland Formation the Colorado-New Mexico state line, and is one of the most productive areas for coalbed methane in the United States. The Fruitland is underlain by the Pictured Cliffs Sandstone, and overlain by the more recent Kirtland Formation. The sequence of rocks represents the final filling of the Cretaceous seaway. The underlying Pictured Cliffs is a marginal marine sandstone, deposited in an environment similar to offshore barrier islands of the southeast United States. As the seaway retreated, the Pictured Cliffs was covered by the Fruitland Formation, which was deposited in near-shore swampy lowlands. The formation is dated to the late Campanian
Brazos Island and the Rio Grande river. Brazos Island State Scenic Park, also known as Brazos Island State Recreation Area, is located on the island. The beach at this state park is known as "Boca Chica." Brazos Island Brazos Island, also known as Brazos Santiago Island, is a barrier island on the Gulf Coast of Texas in the United States, south of the town of South Padre Island. The island is located in Cameron County. The island is also known as Brazos Santiago Island, a reference to the port of Brazos Santiago, the first Spanish settlement on the island. Later it became