[Annals N. Y. Acad. Sct., Vol. XXIII, pp. 85-143, pll. I-VI. 12 December, 



1913] 



A CONTRIBUTION TO THE GEOLOGY OF THE WASATCH 



MOUNTAINS, UTAH ^ 



By Ferdinand Friis Hintze, Jr. 



{Read by Utle before the Academy, 5 May, 1913) 



CONTENTS 



Page 



Introduction 86 



Physiography 87 



Origin of the Wasatch Mountains 87 



Dissection and drainage 88 



Glaciation 01 



Stratigraphy 92 



Introductory statement 92 



Big Cottonwood section 93 



Quartzite-Slate series 94 



Big Cottonwood section 95 



Age of series 95 



Relation of Algonkian to Archean 99 



Origin and nature of the Algonkian sediments 102 



Cambrian strata 103 



Ordovician strata 105 



Section in South Fork 105 



Silurian strata 107 



Devonian strata 108 



Section in South Fork 109 



Section in Green Canyon 110 



Ouray type of Devonian in the Central Wasatch Ill 



Mississippian strata 113 



Unconformity between the Mississippian and Pennsylvanian 115 



Mercur section 117 



Pennsylvanian strata 120 



Weber quartzite 120 



Park City and later formations 123 



Tentative correlation table 126 



Structure 127 



Introductory statement 127 



Structure of the Central Wasatch 127 



Little Cottonwood granite 128 



Structure near Alta 130 



Alta overthrust 133 



A minor overthrust 136 



Faults 137 



Superior fault 138 



1 Manuscript received by the Editor, 26 April, 1913. (85) 



