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Moderate volumes of dry gas are produced in the South Padre Island Area of offshore south Texas from a 120-m-thick aggregation of mixed shoreface and shelf sandstones that are interbedded with thin neritic shales. These shallow marine sediments aggraded on a broad stable shelf platform during the middle Miocene depositional episode when block faulting and basin filling within the Rio Grande Rift disrupted regional drainage patterns and caused an abrupt decrease in sediment supply to the Rio Grande Embayment. Because sediment influx to south Texas was significantly reduced, middle Miocene sandstones were deposited less than 10 km landward of...

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