IV NOTE. 
is situated the famous Comstock Lode, drawn to a scale of 1 inch to 500 feet, 
will be published to the scale of 1 inch to 1,500 feet, making a map of the 
size of four regular atlas sheets. 
The following Geological Maps, forming a part of those supplementing 
Volume III, based upon the topographical sheets, have been published, 
i. e., Title-Page, Index Sheet, Restored Outline of Lake Bonneville, Nos. 50, 
59, 4 of 58, and $ of 66, 67, 75, 76, and 83. Other sheets are in course of 
completion. 
The Topographical Atlas referred to, embracing the entire area west 
of the 100th meridian, will comprise 95 sheets, on a scale of 1 inch to 8° 
miles, numbered consecutively from 1 to 95, inclusive, while the “Geolog- 
ical Atlas” will consist of the same number, using the topographical maps 
as a base. (See Progress Map of 1878.) Upon a number of the topo- 
graphical maps as a base, the classification of lands into the following divi- 
sions, (1) Agricultural with irrigation, (2) Timber, (3) Grazing, (4) Arid 
and Barren, is shown by colors. It is intended to expand this classifica- 
tion to embrace the entire area, thus gathering data upon which a new legal 
subdivision to settlers, to accord with presumable values as to class, may be 
made, pursuant finally to the following divisions: 
Sauk Tac oatean 
1. Agricultural, i ng se deerme 
with irrigation or drainage. 
2. Timber, 1. Large, ) with prevailing species, as Live Oak, 
2. Small, Cedar, ete. 
1. Good, 
2. Bad, 
. Arid or barren, including ‘desert lands.” 
Grazing, with species and quality of grasses. 
et 
Swamp and overflowed. 
6. Location of the precious and economic minerals, such as— 
1. Gold, in place or placer. 8. Tin and nickel. 
2. Silver. 9. Antimony and arsenic. 
3. Cinnabar. 10. Sulphur. 
4. Copper. 11. Sodium, chloride and carbonate of. 
5, Lead. 12. Alum and borates. 
6. Tron. 13. Peats, marls, and clays. 
7. Coal. 
