 Habitat features associated with the armor rock and concrete tetrapods surrounding the island support a microecosystem, a rich and varied fauna and flora associated with the high-relief solid substrate of the island, which differs substantially from the more depauperate natural bottom habitats in the area.The offshore leasing of the Rincon Oil Field began from 1929 to 1931 with the issuance of leases for the lands and ended in 1955 with the issuance of a new state lease, PRC 1466.Several different oil companies have held these leases over the years.