. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . ronousSeposits of the later formations of the western and eastern portionsof,the United States. The Texas region has been the transitionground, and hence all the geologic deposits, beginning with theCarboniferous, have two faces, dependent upon tneir geographicalposition east or west of 100° W. long., and representing the sedi-ments either of interior-continental basins or of the .waters of theAtlantic daring alternating periods of submergence and emergence. T ii: X A S 203 The Carboniferotis rocks, and
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . ronousSeposits of the later formations of the western and eastern portionsof,the United States. The Texas region has been the transitionground, and hence all the geologic deposits, beginning with theCarboniferous, have two faces, dependent upon tneir geographicalposition east or west of 100° W. long., and representing the sedi-ments either of interior-continental basins or of the .waters of theAtlantic daring alternating periods of submergence and emergence. T ii: X A S 203 The Carboniferotis rocks, and most of the succeeding formations,are exposed in two widely separated portions of the State withentirely different lithological and faunal aspects. The mutual re-lations of these series have never been traced The first occurs in^ 1 ^? ?«g<» between 97° and 100° W. long., north of theColorado river, and consists of clavs, sandstones, conglomerates,hmestones, and coal seams of workable thickness. It ia the south-western prolongation and termination of the Coal-measures of the. i* MiOSWPO-0*KOtA ••C0COM>*MirCX>U ji/^A nfuks,,.,,.. CA^S ICtMi. UtMJUtSt,PJU-OMBWiAW Geolojjical map ul United States. These rocks, although in general similar tothem, differ in some respects from those of the same formationfurther east, and also exhibit a few resemblances to the srictlymarine Carboniferous of the Rocky Mountain region (£.-). Io theother series belongs the traus-Pecos Carboniferous (k). Altloughthis is of the same geologic age as the eastern Coal-mea;;ures, it iaa purely marine deposit of limestones and sandstones, ami is barrenof vegetable remains. It is exposed along the Guadalupe and othermountains of the trans-Pecos region, forming the most easternoutcrops of the non-coal-bearing Carboniferous of the west. Thestudy of the areal distribution and relation of the strata interveningbetween the Carboniferous and the fully-identified Cretaceous inTexas ha
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