Depositional history and rate of deposition of a flood-tidal delta, central Texas coast.
Valastro, S., Jr.
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C14 dating of shells from Harbor Island, a flood tidal delta complex on the Central Texas coast, indicates that basal barrier island sand began accreting 6300 years ago at about 10 meters below present sea level. By 4900 years B.P., with sea level about 6 meter below present, a bay developed behind the barrier, and bay mud deposition proceeded at the rate of 2.4 meters per thousand years. 3400 years ago sea level in this area was about 2 meters below present. At that time the tidal delta facies that compose the present surface of the Harbor Island complex began to accrete at the rate of 0.06 meters per thousand years.