﻿4 
  ST 
  

  

  CONTENTS 
  

  

  Page. 
  

   Report 
  of 
  F. 
  V. 
  Hayden, 
  United 
  States 
  Geologist-ix-Charge 
  : 
  

  

  Letter 
  to 
  the 
  Secretary 
  1 
  

  

  PART 
  I.— 
  GEOLOGY. 
  

  

  Report 
  of 
  A. 
  C. 
  Peale, 
  M. 
  D., 
  Geologist 
  of 
  the 
  Grand 
  River 
  Division 
  : 
  

  

  Letter 
  to 
  Dr. 
  F. 
  V. 
  Hayden 
  31 
  

  

  Geological 
  report 
  oa 
  the 
  Grand 
  River 
  District 
  : 
  

  

  Chapter 
  I. 
  General 
  introduction 
  33 
  

  

  Chapter 
  II. 
  Surface 
  geology 
  — 
  Los 
  Pinos 
  agency 
  to 
  Uncompahgre 
  Val- 
  

   ley 
  — 
  Gunnison 
  River 
  and 
  Uncompahgre 
  Plateau 
  37 
  

  

  Chapter 
  III. 
  Surface 
  geology 
  — 
  San 
  Miguel 
  and 
  Dolores 
  Rivers 
  — 
  Una- 
  

   weep 
  Canon 
  — 
  Sierra 
  La 
  Sal 
  and 
  Grand 
  River 
  51 
  

  

  Chapter 
  IV. 
  Archsean 
  rocks 
  , 
  64 
  

  

  Chapter 
  V. 
  Stratigraphy 
  — 
  PalsBozoic 
  rocks 
  70 
  

  

  Chapter 
  VI. 
  Stratigraphy 
  — 
  Mesozoic 
  rocks 
  80 
  

  

  Chapter 
  VII. 
  Eruptive 
  rocks 
  — 
  Trachorheites 
  — 
  Breccia 
  — 
  Porphyritic 
  

  

  trachyte 
  — 
  Basalt 
  93 
  

  

  Chapter 
  VIII. 
  Economical 
  geology 
  99 
  

  

  Report 
  of 
  F. 
  M. 
  Endlich, 
  S. 
  N. 
  D., 
  Geologist 
  of 
  the 
  Southeastern 
  Division 
  : 
  

  

  Letter 
  toDr.F. 
  V. 
  Hayden 
  103 
  

  

  Geological 
  report 
  on 
  the 
  Southeastern 
  District: 
  

  

  Introduction 
  105 
  

  

  Chapter 
  I. 
  Sangre 
  de 
  Cristo 
  Range 
  and 
  the 
  Huerfano 
  region 
  108 
  

  

  Chapter 
  II. 
  San 
  Luis 
  Valley 
  140 
  

  

  Chapter 
  III. 
  The 
  Sawatch 
  Range 
  150 
  

  

  Chapter 
  IV. 
  The 
  San 
  Juan 
  region 
  176 
  

  

  Chapter 
  V. 
  Post-Cretaceous 
  beds 
  of 
  the 
  Trinidad 
  region 
  192 
  

  

  Conclusion 
  207 
  

  

  Appendix 
  A. 
  — 
  Ancient 
  glaciers 
  in 
  Southern 
  Colorado 
  216 
  

  

  Appendix 
  B. 
  — 
  Catalogue 
  of 
  the 
  minerals 
  of 
  Colorado 
  226 
  

  

  Report 
  of 
  William 
  H. 
  Holmes, 
  Geologist 
  of 
  the 
  San 
  Juan 
  Division 
  : 
  

  

  Letter 
  to 
  Dr. 
  F. 
  V. 
  Hayden 
  237 
  

  

  Geological 
  report 
  on 
  the 
  San 
  Juan 
  District 
  : 
  

  

  Chapter 
  I. 
  General 
  review 
  of 
  the 
  district 
  — 
  Orographic 
  features 
  241 
  

  

  Chapter 
  II. 
  La 
  Piata 
  Valley 
  . 
  245 
  

  

  Chapter 
  III. 
  Metamorphic 
  and 
  Eruptive 
  areas 
  268 
  

  

  Report 
  of 
  B. 
  F. 
  Mudge 
  : 
  

  

  Notes 
  on 
  the 
  Tertiary 
  and 
  Cretaceous 
  periods 
  of 
  Kansas 
  277 
  

  

  PART 
  II.— 
  GEOGRAPHY 
  AND 
  TOPOGRAPHY. 
  

  

  Report 
  of 
  A. 
  D. 
  Wilson, 
  Topographer 
  of 
  the 
  Southeastern 
  Division 
  : 
  

  

  Letter 
  to 
  Dr. 
  F.V. 
  Hayden 
  297 
  

  

  Topographical 
  report 
  on 
  the 
  Southeastern 
  District 
  299 
  

  

  By 
  Franklin 
  B. 
  Rhoda, 
  assistant 
  topographer 
  302 
  

  

  Report 
  of 
  Henry 
  Gannett, 
  M. 
  E., 
  Topographer 
  of 
  the 
  Grand 
  River 
  Di- 
  

   vision 
  : 
  

  

  Letter 
  to 
  Dr. 
  F. 
  V. 
  Hayden 
  335 
  

  

  Topographical 
  report 
  on 
  the 
  Grand 
  River 
  District 
  337 
  

  

  REPOliT 
  OF 
  GEOIiGE 
  B. 
  ChITTENDEN, 
  TOPOGRAPHER 
  OF 
  THE 
  SaN 
  JUAN 
  DIVISION 
  : 
  

  

  Letter 
  to 
  F. 
  V. 
  Hayden 
  o51 
  

  

  Topographical 
  report 
  on 
  the 
  San 
  Juan 
  District 
  353 
  

  

  Report 
  of 
  Gustavus 
  R. 
  Bechler, 
  Topographer 
  : 
  

  

  Letter 
  to 
  Dr. 
  F. 
  V. 
  Hayden 
  ?A)0 
  

  

  Geographical 
  report 
  on 
  the 
  Middle 
  and 
  South 
  Parks, 
  Colorado 
  and 
  adjacent 
  

  

  country 
  371 
  

  

  Chapter 
  I. 
  Tlie 
  crest 
  of 
  the 
  main 
  Rocky 
  Mountains 
  from 
  latitude 
  40° 
  

  

  31' 
  to 
  Tcnnessoe 
  Pass, 
  (130 
  miles) 
  373 
  

  

  Chapter 
  II. 
  The 
  Middle 
  Park, 
  its 
  drainage 
  and 
  characteristics 
  391 
  

  

  iii 
  

  

  