Page 5 - The Geology and Ore Deposits of Sierra County, New Mexico - Bulletin 10

CONTENTS
Page Introduction ____ _ ----------------------------------------------------- 11 Purpose and scope of report 11 Acknowledgments 13 PART I, GENERAL FEATURES ----------------------------------- 15 Geography ------------------------------------------------------------ 15 Location ------------------------------------------------------------------------15 Culture ------------------------------------------------------------------------- 15 Mining districts 16 Climate and vegetation ----------------------------------------------- 16 Physiographic features ------------------------------------------------ 18 Drainage 18 Mountains ------------------------------------------------------------- 18 Bolson plains 20 Geology 23 The rocks ----------------------------------------------------------- 23
General features Pre-Cambrian rocks • Sedimentary rocks
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---------------------------------------------------- 24 24 24 El Paso limestone 24 Montoya limestone 25 Silurian system 25 Fusselmanlimestone ------------------------------------------------25 Devonian system ---------------------------------------------- 26 Percha shale -------------------------------------------------- 26 Mississippian system ---------------------------------------------------26 Lake Valley limestone 26 Pennsylvanian system 27 Magdalena limestone ----------------------------------- 27 Permian system 27 Abo sandstone 27 Chupadera formation ----------------------------------------28 Cretaceous system --------------------------------------------- _ 28
Cambrian system Bliss sandstone Ordovician system
Dakota sandstone
Mancos shale and Mesaverde formation 29
Tertiary system ------------------------------------------------ 29
Quaternary system 30 Tertiary and Quaternary lavas 31 Intrusive rocks 34
Structural features 35
Geological sequence ------------------------------------------------------------- 37 History of mining in Sierra County ------------------------------------------- 41 Production -------------------------------------------------------------------- 43 Ore deposits 47
Geographic distribution ---------------------------------------------- 47 Geologic distribution of deposits --------------------------------- 47 Mineralogy of Sierra County ------------------------------------ 50
Practical features of prospecting and mining ----------------------- 51 PART II, MINING DISTRICTS ------------------------------------ 59
The Black Range ----------------------------------------------------- 59 Location and area ---------------------------------------------------- 59 Geography 59
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