Photograph of a historic property located at 14075 Gordon St. in Alvin, Texas.

Photograph of a historic property located at 14075 Gordon St. in Alvin, Texas.

Photograph of the Hotel Alvin (located at W. Willis at N. Hardie) in Alvin, Texas.

Photograph of the Hotel Alvin (located at W. Willis at N. Hardie) in Alvin, Texas.

Report on the land-surface subsidence in the Texas coastal region published in agreement with the U.S. Geological Survey. Includes information on the geography and topography of 5 different subregions of the Texas coastand maps of the different areas.

Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24,000

Twenty-three shale samples ranging in depth from 5194 ft to 13,246 ft from Gulf Oil Corporation No. 2 Texas State Lease 53034 well and 33 shale samples ranging in depth from 2185 ft to 15,592 ft from General Crude Oil Company/Department of Energy No. 1 Pleasant Bayou well were examined by x-ray techniques to determine the mineralogy of the geopressured zone in the Brazoria Fairway. Both wells have similar weight-percent trends with depth for a portion of the mineralogy. Calcite decreases, and plagioclase, quartz and total clay increase slightly. Within the clays, illite in mixed-layer illite/smectite (I/S) increases and smectite in mixed-layer I/S decreases. Four minerals have distinctly different trends with depth for each well. In the No. 2 Texas State Lease 53034 well, potassium feldspar and mixed-layer I/S decrease, kaolinite increases, and discrete illite is constant. In the No. 1 Pleasant Bayou well, potassium feldspar and kaolinite are constant, mixed-layer I/S increases, and discrete illite decreases.

The lower Frio Formation in eastern Brazoria County, upper Texas Gulf Coast, was deposited in a high constructive deltaic environment in the Houston delta system. Constructive elements of the stacked, elongate to lobate deltas that were intersected in core are storm induced delta front splays, delta front slump deposits, and distributary mouth bar, distributary channel and delta plain assemblages. Reworked and winnowed abandonment facies that are volumetrically insignificant relative to constructive elements are subdivided into a crossbedded shoreface-foreshore subfacies and a fine grained cyclic sequence of storm deposits on the lower shoreface that represent a distal abandonment subfacies. Micropaleontological evidence indicates that deposition of constructive and abandonment facies took place in water depths of less than 120 feet.

Photograph of the Old Brazoria County Courthouse in Angleton, Texas.

Photograph of the Old Brazoria County Courthouse in Brazoria, Texas.

Photograph of the Old Brazoria County Courthouse in Brazoria, Texas.

Photograph of the Old Brazoria County Courthouse in Angleton, Texas.