124 



Minerals and geological specimens — Continued. 



55 

 59 

 60 

 61 

 62 

 63 

 G4 

 65 

 66 

 67 

 68 

 69 

 70 

 71 

 72 

 73 

 74 

 75 

 76 

 77 

 78 

 79 

 80 

 81 

 82 

 63 

 84 

 85 

 86 

 87 



89 

 90 

 91 

 92 

 93 

 94 

 95 

 96 



it7 



98 

 99 

 100 

 101 

 102 

 103 

 104 

 105 

 106 

 107 

 108 

 109 

 110 



Hornblende elate 



Felspathic granite, pink 



Plates of mica from 59 , 



Quartz vein in chlorite slate.-.. 



Chlorite slate 



Trachyte 



Quartz veins in 63 



do 



Chlorite slate 



Hornblende rock, underlying tertiary series 



Schorl in quartz from clay slate 



do do .- 



Augite 



Quartz, with felspar 



Porphyritic trap, columnar 



do do , 



do do 



Trachyte , 



Vesicular trap , 



Trachyte 



Silicious limestone 



Porphyritic trachyte , 



Compact trachyte, with scales of mica 



do do. 



Gray basaltic trap ...... . . , 



Porphyritic trachyte 



do . 



Quartzite..... 



Gray trachyte 



Metamorphic sandstone 



]I. SEDIMENTARY ROCKS. 



Silurian and devonian. 



Potsdam sandstone, red, with Lingula antiqua. 



do gray, fine, with Obolm 



do porous, with Trilobites .. 



Metamorphic, conglomerate over granite 



...do.. . with cherty pebbles 



do do 



Argillaceous limestone, devonian 



Metamorphic conglomerate 



Carboniferous. 



Limestone, with spirifer 



Blue cherty limestone, with Spirvjera suhUlita 



.do do with corals 



..do do with Spirifer lineaiiis 



Rhyncondla mormoni . ... 



do do with Cyathophyllum.. 



.. .do ..do .. with Zaphrentis ...... 



do .do v!iihSyringapora.... 



do do . Poriies .. . . 



Yellowish do. over 98, with Spirifer rockymontana . . 



do do Spirifers cameratus and lineaius 



Cherty nodules in 98 



Arogoniie in 98 



Coarse, granular limestone, with crinoidal columns 



Black hills , 



do., 



do. 



do., 



, do., 



do. 



do., 



, do.. 



Raw Hide butte, west side 

 do do 



Black hills 



do 



do 



Laramie hills 



Stone butte. Black hills . 



do do... 



do do... 



do do... 



do do... 



do do... 



Raw Hide butte . 



Stone butte, Black hills. 

 Bear peak, Black hills . . 

 do do... 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 



do.... 



do.... 



do 



Laramie hills 

 do.... 



.do. 

 .do. 

 .do. 



.do. 

 .do. 

 .do. 



Black hills 



do. 



do. 



do. 



do.... 



do.... 



do.... 



do.... 



do.... 



do.... 



do.... 



do.... 



do.... 



Fort Laramie 



