9 
In addition to these assistants who have been employed 
by the Survey, we have had aid from the U. S. Geological 
Survey, as already indicated above, in the work of Mr. O. W. 
Hayes and his assistants, who have spent several seasons in 
making the measured section spoken of, and in that of Mr. 
L. ©, Johnson, who has devoted to our work about six 
months of the past year. 
Mr. T. H. Aldrich continues as a volunteer, his study of 
our Cretaceous and Tertiary fossils, and Mr. D. W. Langdon 
has given about two weeks of his time to us recently. 
The topographic work of the U. 8. Geological Survey in 
our State is going on, and will, in the next three or fours 
years, have been extended over the entire area of the War- 
rior Coal Field, and we shall then have a good topographic 
map on the scale of about two miles to the inch, upon which 
to show the geology of this region. These topographic 
maps will make admirable base maps for the illustration of 
the detailed geological work which the Survey now proposes 
to undertake, and electrotype reproductions of the plates of 
these maps will be furnished to the State Survey at the cost 
of making the same. 
I have the honor to be, 
‘Yours most respectfully, 
EUGENE A. SMITH, 
State Geologist. 
