. Annual report of the United States Geological Survey to the Secretary of the Interior . tone and thebasal Denison beds. This abrupt termination is caused by the south-west downthrow of the rock of the Dakota. The fault at this locality,according to Tuff, bears approximately N. 42° W. Two miles east of Pottsboro the Dakota sand appears on the north-east side of the fault, and abuts abruptly against the fault line froma point due east of Pottsboro to Cook Spring, 6 miles north ofSherman. Near Cook Spring the buse of the Austin chalk is brought downso that it opposes the upper beds of the Woodb
. Annual report of the United States Geological Survey to the Secretary of the Interior . tone and thebasal Denison beds. This abrupt termination is caused by the south-west downthrow of the rock of the Dakota. The fault at this locality,according to Tuff, bears approximately N. 42° W. Two miles east of Pottsboro the Dakota sand appears on the north-east side of the fault, and abuts abruptly against the fault line froma point due east of Pottsboro to Cook Spring, 6 miles north ofSherman. Near Cook Spring the buse of the Austin chalk is brought downso that it opposes the upper beds of the Woodbine formation, while tothe northwest the huso of the Eagle Ford formation is brought downso as to oppose the Fort Worth limestone. East of the outcrop ofthe Austin chalk in Grayson County the faults of this zone are notdirectly traceable in the unconsolidated rocks of the Black Prairie,although their presence there is revealed by their effect upon t he area!distribution of the formations. At Moss Springs, on Iron Ore Crook, • > miles north of Sherman, the U. S. GEOLOGICAL SURVEY. SECTIONS OF CRETACEOUS FORMATIONS AT TUCUM A, Tucumcari Mesa; R Double Mountain. Stonewall County; C, Muchakuya; D, Moi|
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