. Annual report of the United States Geological Survey to the Secretary of the Interior . le that the Burnet district of Algonkian, granitic,Cambrian, and Ordovician rocks represents a buried pre-Cretaceous HILL.] PEKMIAN AND PEKMO-CAKBONIFEKOUS. 105 orogenic area or elongated dome which extends south and has aneast-west trend toward the Balcones scarp line and west to the displacement along the Balcones fault may be due to the adjust-ment of the coastward load of sediments to this ancient fundamentalfeature. A volume of unwritten and uninterrupted histoiw presents itselfwhen we cons
. Annual report of the United States Geological Survey to the Secretary of the Interior . le that the Burnet district of Algonkian, granitic,Cambrian, and Ordovician rocks represents a buried pre-Cretaceous HILL.] PEKMIAN AND PEKMO-CAKBONIFEKOUS. 105 orogenic area or elongated dome which extends south and has aneast-west trend toward the Balcones scarp line and west to the displacement along the Balcones fault may be due to the adjust-ment of the coastward load of sediments to this ancient fundamentalfeature. A volume of unwritten and uninterrupted histoiw presents itselfwhen we consider the Permo-Carboniferous and Permian beds of thegreat Central Province. Their strike in a more uniformly north-southdirection than the Carboniferous rocks which they border, their com-position and occurrence in a great central basin entirely west ofthe main areas of the Coal Measures, and the absence of the Permianstrata within the Carboniferous area indicate that the configuration tothe east was changing by degradation during their deposition. 106 BLACK AND GRAND PRAIRIES, HILL.] IMPOKTANCE OF THE CEETACEOUS. 107 CRETACEOUS Statement. The Cretaceous formations are by far the most important in Texas,both in area and in economic value. Their composition produces cer-tain features of value to man. Their texture and stratigraphic arrange-ment in the Black and Grand prairies is conducive to transmission orretention of underground waters and results in most extensive andprolific artesian-well systems. They supply the most valuable soil,building material, stone, lime, and cement of all the formations, andin one instance are the source of valuable oil fields. It is thereforenecessary to give a thorough description of these rocks, including theircomposition, texture, thickness, arrangement, distribution, and classi-fication. They have been briefly and technically described in previouswritings of the author1 and others, but will now be treated in greaterde
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