Summary Report for the 2010-2011 STATEMAP Project: Geological Mapping to Support Improved Database Development and Understanding of Urban Corridors, Critical Aquifers, and Special Areas of Environmental Concern in Texas

Two geologic maps have been produced for this study: The Project 1 map of the east part of the Cleburne 30 x 60 minute quadrangle, North-Central Texas, scale 1:100,000, was constructed through mapping and compilation of twenty 1:24,000-scale geologic work maps. The map and related data provide a basic geologic framework to aid in managing water and Earth resources, planning land use, identifying aquifer recharge areas, and identifying sources of aggregate and other earth resources. Geology of the area consists of Cretaceous (Albian to Coniacian) limestone, argillaceous limestone, marl, shale, and sandstone exposed across the study area, composing more than 1,500 ft of Cretaceous shelf and shore-zone deposits. This stratigraphy includes the Woodbine and Paluxy Sandstones - sources of sand within the unit's outcrop belt and important aquifers in the subsurface. Edwards and Comanche Peak limestones are also resources for lime and aggregate. Some local limestone pits are within the Georgetown Formation as well.

The Project 2 map of the Matagorda-Matagorda SW quadrangles includes the Colorado River Delta and Matagorda Peninsula of the Texas Gulf Coast. This map is intended to be used as a source of basic geologic information for managing land resources of the area and for studying shoreline changes, geologic depositional environments, land changes due to human activities, and active faulting. Geology of the area consists of Pleistocene Beaumont Formation distributary, interdistributary, and abandoned-channel sand, silt, and clay and Holocene to Modern beach, dune, tidal-flat, washover, distributary, levee, marsh, swamp, and floodplain - sand, silt, and clay deposits. Marsh, tidal-flat, and back-barrier deposits are faulted.