82 The American Geologist. February, i9o5 
were either undiscovered or undeveloped. It is impossible 
at this late day to determine the extent to which the State 
has been benefited by his work. 
Dr. Troost was the first to call attention to the de- 
posits of marble in east Tennessee whose development has 
become so important an industry, and if this had been the 
only result of his work the state would have been amply 
repaid for all of the expenditures incurred in the survey. 
Although Dr. Troost soon obtained a good knowledge 
of the geology of Tennessee, he never succeeded in unravel- 
ing the complicated structure of the eastern part of the state. 
In his illustrated sections across the state he represented tbe 
folded and faulted beds of east Tennessee as a continuous 
series from the North Carolina line westward, dipping at a 
uniform, steep angle westward beneath the Cumberland 
plateau and never reappearing in middle Tennessee as they 
are known to do, though in his later reports he recognizes 
the rocks of middle Tennessee as Silurian. 
He was wedded to the old European classification and 
although he at last came to use the terms Cambrian and 
Silurian instead of grauwacke, he deprecated the day when 
each state might have its own peculiar set of geological 
names based on local terms and was hardly willing to admit 
that there was any merit in the New York system. 
The results of Dr. Troost's work as state geologist 
were embodied in ten reports made to the legislature. Sev- 
eral of these reports were never published and those that 
were published are rarely found to-day. There is much 
ignorance concerning certain of them. 
The address delivered to the legislature on October i6, 
183 1, is generally regarded as the first report and is even 
catalogued as such whereas it was really a plea for the estab- 
lishment of a survey. The first report was presented at the 
called session of the legislature in 1832 and read in the 
House on September 18, 1832,* but failed to be ordered 
printed. It contained a general account of the more promi- 
nent geological features of the state so far as then known to 
Dr. Troost and a particular description of Davidson county 
in which Nashville is situated and outlined the extent of the 
* House Jour., Called Ses. of 1832, p 40. 
