. Annual report of the United States Geological Survey to the Secretary of the Interior . SECTIONS OF CRETACEOUS FORMATIONS AT TUCUM A, Tucumcari Mesa; R Double Mountain. Stonewall County; C, Muchakuya; D, Moi|. Of THF HILL.] CONCLUSIONS CONCERNING CRETACEOUS. 885 fault crosses the creek. The upper strata of the Lewisville beds onthe downthrown side of the fault abut against the upper strata of theDexter sands on the upthrown side. The Balcones fault zone is probabty due to the adjustment by weightof the Cretaceous rocks to the slope of the buried eastern margin ofthe Wichita paleoplai
. Annual report of the United States Geological Survey to the Secretary of the Interior . SECTIONS OF CRETACEOUS FORMATIONS AT TUCUM A, Tucumcari Mesa; R Double Mountain. Stonewall County; C, Muchakuya; D, Moi|. Of THF HILL.] CONCLUSIONS CONCERNING CRETACEOUS. 885 fault crosses the creek. The upper strata of the Lewisville beds onthe downthrown side of the fault abut against the upper strata of theDexter sands on the upthrown side. The Balcones fault zone is probabty due to the adjustment by weightof the Cretaceous rocks to the slope of the buried eastern margin ofthe Wichita paleoplain. The Red River fault zone can not at presentbe explained, but it coincides in direction with the older folds of theWichita and Arbuckle mountains. In addition to the displacement by faulting as above described, thereare a few low undulations of the strata. These are incipient folds ofsuch wide area and gentle uplift that they are hardly perceptible tothe eye and cannot be shown to scale in diagrams and cross sections(see PI. LII, E). The most notable of these low folds extends ° E. from the Bosque to the Brazos, and is especially well shownalong the Paluxy between Glen Rose and where the Paluxy emptiesint
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