The marine and sub-aerial sedimentary environments across Mustang Island, Texas, can be differentiated by the volume percentage of heavy minerals in the sediments. The barrier island sediments average .45% heavy minerals and the gulf sediments average .04% heavy minerals. The berm, averaging .34% heavy minerals, is the transition zone between the environments. Analyses of the amount of heavy minerals may be valuable in characterizing the environment of deposition of ancient sediments.

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