. Annual report of the United States Geological Survey to the Secretary of the Interior . he money received from the sale of the Survey publications is deposited in the Treasury, and theSecretary of the Treasury declines to receive bank checks, drafts, or postage stamps. All remittances,therefore, must be by money order, made payable to the Director of the United States GeologicalSurvey, or in currency—the exact amount. Correspondence relating to the publications of theSurvey should be addressed to— The Director, United States Geological Survey,Washington, D. C, June, 1901. Washington, D. C. Q
. Annual report of the United States Geological Survey to the Secretary of the Interior . he money received from the sale of the Survey publications is deposited in the Treasury, and theSecretary of the Treasury declines to receive bank checks, drafts, or postage stamps. All remittances,therefore, must be by money order, made payable to the Director of the United States GeologicalSurvey, or in currency—the exact amount. Correspondence relating to the publications of theSurvey should be addressed to— The Director, United States Geological Survey,Washington, D. C, June, 1901. Washington, D. C. Q 55 0NlvERS(rvOF( Annual report 2 ^MUfJ. WASHINGTON GOVERNMENT PRINTING OFFICE1901 TWENTY-FIRST ANNUAL REPORT OF THE UNITED STATES GEOLOGICAL SURVEY PART VII-TEXAS 54028 GEOGRAPHY AND GEOLOGY OP THE • BLACK AND GRAND PRAIRIES, TEXAS WITH DETAILED DESCRIPTIONS OF THE CRETACEOUS FORMATIONS ANDSPECIAL REFERENCE TO ARTESIAN WATERS BY I ROBERT T. HILL 5 CONTENTS,i Page. Introduction 23 Area treated 23 Sources of data 23 Importance of paleontology 24 Part L Geography of the Texas region 25 The State of Texas 25 Area, relations, and subdivisions 25 Definition of the provinces 27 The relief 29 Relation of formation to relief 30 Kinds of relief-making rocks in Texas region 31 Influence of the marine sedimentaries 32 Influence of nonmarine sedimentaries 35 Influence of the igneous rocks 36 The mountains 37 Ouachita system 37 Mountains of Trans-Pecos Province 38 The plains 39 Classification of plains by origin 39 Constructional plains 40 Destructional plains 41 Plains of the Regional Coastward Slope 42 The Great Plains 43 The prairie
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