KENTUCKY GEOLOGICAL SURVEY. 



Introductory Letter. 



WASHINGTON, D. C., October 31, 1905. 



PROFESSOR CHARLES J. NORWOOD,, 



Director of the Kentucky Geological Survey. 



SIR: I have the honor to transmit herewith a report on the 

 upper Ordovician rocks of Kentucky and their bryozoa. Owing 

 to the limited amount of time which could be devoted to its pre- 

 paration, it can be regarded as little more than a sketch. 



Very respectfully, 



JOHN M. NICKLES. 



