100 J. W. Powell— Organization and Plan 
Second, a division of voleanie geology is organized and Capt. 
Clarence E. Dutton, of the Ordnance Corps of the Army, is 
placed in charge, also with a strong corps of assistants. 
ird and fourth, two divisions have been organized to 
prosecute work on the Archzan rocks, embracing within their 
field not only all rocks of Archzean age, but all metamorphic 
crystalline schists, of whatever age they may be found. The 
first division has for its chief, Prof. Raphael Pumpelly, assisted 
by a corps of geologists, and the field of his work is the ecrystal- 
line schists of the Appalachian region, or eastern portion of 
the United States, extending from northern New England to 
‘Georgia. He will also include in his studies certain Paleozoic 
formations which are immediately connected with the crystal- 
line schists and involved in their orographic structure. ; 
The second division for the study of this class of rocks is in 
charge of Prof. Roland D. Irving, with a corps of geologists, 
and his field of operation is in the Lake Superior region. It is. 
not proposed at present to undertake the study of the crystal- 
line schists of the Rocky Mountain region. 
Fifth, another division has been organized for the study of 
the areal, structural, and historical geology of the Appalach- 
ian region, extending from the Atlantic, westward, to the zone 
which separates the mountain region from the great valley of 
the Mississippi. Mr. G. K. Gilbert has charge of this work, 
and has a large corps of assistants. 
ixth, it seemed desirable, partly for scientific reasons and 
partly for administrative reasons, that a thorough topographic 
and geologic survey should be made of the Yellowstone 
Park, and Mr. Arnold Hague is in charge of the work, with a 
corps of assistants. When it is completed, his field will be 
expanded so as: to include a large part of the Rocky Mountain 
region, but the extent of the field is not yet determined. 
t will thus be seen that the general geologic work relating 
to those areas where the terranes are composed of fossiliferous 
formations is very imperfectly and incompletely organized. 
The reason for this is two fold: first, the work cannot be per- 
formed very successfully until the maps are made; second, the 
Geological Survey is necessarily diverting much of its force to 
the construction of maps, and cannot with present appropria- 
tions expand the geologic corps so as to extend systematic 
work in the field over the entire country. 
Economic GEOLOGY. 
Under the organic law of the Geological Survey, inyeatigns 
tions in economic geology are restricted to those States and 
Territories in which there are public lands; the extension of 
