4 CONTENTS. 
G eulogy — Continued. 
Stratigraphy— Continued. Page. 
Tertiary system , 43 
Cooper Lake basin 43 
Sheep Mountain — Red Mountain region 44 
Little Medicine Bow Valley 44 
Quaternary system 45 
Glacial drift 45 
High terraces 45 
Alluvium 46 
Structure 46 
Laramie mountain slopes 46 
Boulder Ridge anticline 47 
Red Mountain — Jelm Mountain area 48 
Centennial Valley 49 
Sheep Mountain to Arlington 50 
Rock River anticline 51 
Rock Creek anticline 51 
Como anticline 52 
Flattop anticline 52 
Freezeout uplift 53 
Mineral resources 53 
Coal 53 
Gypsum 56 
Rock gypsum 56 
Gypsite 58 
Bentonite 58 
Occurrence and character 58 
Composition 59 
Use 60 
Descriptions of localities 30 
Rock Creek region 60 
Chalk Bluffs 61 
Hutton Lakes 61 
Sand Creek 61 
Riverside 61 
Production and prices 61 
Sulphate of soda 61 
Sulphate of magnesia 64 
' Volcanic ash 65 
Cement 65 
Sand 65 
Clay 66 
Limestone 66 
Copper , 66 
Underground waters 67 
General conditions 67 
Description of wells 68 
Laramie 68 
Union Pacific Railroad 72 
Pelton ranch 73 
Trabing ranch 73 
Downie ranch 73 
Alsop ranch 73 
