KENTUCKY GEOLOGICAL SURVEY. 



The Upper Ordovician Rocks of Kentucky and 



their Bryozoa. 



Introduction. 



A month in the early summer of 1905 was spent by the writer 

 in a rather hasty examination of outcrops: in various parts of 

 central and northern Kentucky to determine for geologic map- 

 ping purposes the boundaries between formations in certain 

 doubtful cases, and to ascertain to what extent the subdivisions 

 of the Cincinnatian series made in Ohio and Indiana can be rec- 

 ognized in Kentucky. This examination forms the basis of this 

 report. For lack of time a considerable part of the collections of 

 fossils made could not be examined, hence the report lacks the 

 fullness and completeness wlnich the subject deserves. While 

 some problems have become clearer and in a fair way to solution, 

 others have arisen which require additional fieldwork. During 

 part of the time the writer had the guidance of Dr. Aug. F. 

 Foerste and for the remainder that of Prof. Arthur M, Miller, of 

 the State College of Kentucky. To these gentlemen, whose accu- 

 rate knowledge of Kentucky localities very greatly expedited the 

 purposes in view, is due in large measure what value this re- 

 port may have. For much other kindness on their part and for 

 pleasant companionship, the writer expresses his thanks; also 

 to Prof. Charles J. Norwood, the Director of the Survey, for 

 many courtesies. 



General. 



The blue grass region of Kentucky is widely famed for the fer- 

 tility of its soil and the consequent prosperous condition of its 

 population. It is a comparatively level country, an old pene- 



