654 A. M. Miller — Ordovician Oynthiana Formation. 



Wilmore is exposed at lowest levels as far north as Butler 

 with an unexposed interval representing the Bigby next above. 

 (It would appear from latest investigations that Bigby should 

 be made to include all of the Lexington between the Wilmore 

 and Perryville.) Tbe interval however is n'ot sufficient to 

 admit of the entire thickness that this formation attains in the 

 region around Lexington to the south. 



At the Lower Blue Licks the top of the Lexington (Trenton) 

 is about 55 feet above the river and is very sparingly fossil- 

 iferous. However the presence of JRkynchotrema inceqtiivalve, 

 Hindia parva and a Lexington type of Lophospira indicates 

 that the "Woodbnrn bed of the Bigby is present this far north 

 in Kentucky. The Cynthiana follows immediately above and is 

 here 85 feet thick with the typical lithology and fossils of this 

 formation as developed on the eastern flank of the Cincinnati 

 Anticline. The usual wave-marked crinoidal limestone appears 

 at the top. West of Blue Licks on the South Fork of the 

 Licking, in the vicinity of Cynthiana, the section is similar : 

 — the Cynthiana rests on limestones with Mynchotrema 

 incequivalve that are undoubtedly of Bigby age. 



Further south in the vicinity of Paris, but in the same drain- 

 age area, the usual relation of the Cynthiana to upper and 

 lower formations prevails ; but at one locality, about one mile 

 northeast of Paris, a small patch of the Perryville bed of the 

 Lexington (Trenton) appears on top of the Woodburn member 

 of the Bigby — the only known occurrence of this bed on the 

 eastern side of the Cincinnati Anticline. 



Still further south, in the Kentucky River drainage, and in 

 the vicinity of Lexington, on and near the crest of the Cin- 

 cinnati Anticline, the Cynthiana has decreased in thickness to 

 about 40 feet and every contact with the underlying formation 

 'shows that it rests on the Woodburn member of the Lexing- 

 ton. However in the soil of some places are found traces of a 

 gastropod — chert, which indicates that at least the lowest por- 

 tion of the Perryville (also of the Lexington formation) — the 

 Faulconer — was present and that over it the deposition of the 

 Cynthiana transgressed. 



West of Lexington, beyond the middle and western portion 

 of Woodford County, the two lower members of the Perryville 

 — the Faulconer and Salvisa — are generally present and the 

 Cynthiana rest on the last named member. In Franklin 

 County in the vicinity of Frankfort, these two members of the 

 Perryville are also generally present and thicker than further 

 east. Southward from Franklin County on the west side of 

 the Cincinnati Anticline the Perryville thickens, and in Mercer 

 County another member — the Cornishville — is added to the 

 top, and it is upon it that the Cynthiana of the Cincinnatian 

 series rests. 



