842 E. O. ULRICH CORRELATIONS OF CHESTER FORMATIONS 



The first was observed with Mr. Butts in making the section south of 

 Somerset, Kentucky — number 4 of the chart. At Cedar Grove station, 

 about 5 miles south of Somerset, is a large quarry, mainly in the upper 

 30 feet of the Sainte Genevieve limestone. Above this the quarry cuts 

 some 15 or 20 feet of Lower Gasper. At the top of the Sainte Genevieve 

 is a 3- to 4-foot bed of yellowish argillaceous limestone which weathers 

 to a marly clay or shale. Under this is a subcrystalline and oolitic ledge 

 varying from 3 to 4 feet in thickness within the length of the quarry. 

 Beneath this again is a clayey limestone like the one at the top of the 

 formation. The two clayey layers are practically unf ossilif erous ; the 

 intervening crystalline limestone also is nearly barren of specifically de- 

 terminable remains. However, after prolonged search, a few specimens 

 of Pentremites princetonensis and a young example of P. buttsi were 

 found in the crystalline layer at the north end of the quarry. 



Leaving the quarry, we proceeded northward along the railroad track 

 a third of a mile to a low cut and then to a second somewhat deeper cut. 

 Both cuts expose the three top beds of the Sainte Genevieve, maintaining 

 their respective characteristics as in the quarry except in two features : 

 First, the somewhat oolitic middle bed increases in thickness first to about 

 10 feet and in the second cut to nearly 20 feet. The second difference is 

 that in both cuts this massive bed is simply crowded with small Pen- 

 tremites, Mesoblastus, and Talarocrinus. Indeed, through streaks of a 

 foot or more in thickness, these remains constitute approximately half 

 of the rock-mass. Such near-by prodigality would never be suspected 

 from an examination of the quarry face and adjacent natural exposures. 

 Moreover, neither in the quarry nor in the railroad cuts did we see a sign 

 of Platycrinus. If we had depended here on the first occurrence of re- 

 mains of the Platycrinus, it is hard to say where the boundary between 

 the Gasper and the Sainte Genevieve would have been drawn. 



The other case is concerned with an exceedingly important association 

 of whole crinoids that were found in Owen Count} r , Indiana, by an 

 amateur collector, Mr. Alva Schaefer, in a small exposure of Upper 

 Sainte Genevieve limestone at a country post-office then known as Mill 

 Grove. These crinoids, together with many other beautiful specimens 

 from other formations and localities in southern Indiana, were presented 

 three years ago by the collector to the U. S. National Museum and turned 

 over to me for study. Eecognizing the importance of this collection in 

 the solution of problems pertaining to disputed correlations of Lower 

 Chester formations, I planned and carried out a visit to the concerned 

 locality. Mr. Butts, who also is interested in these questions, accom- 

 panied me. After considerable difficulties, owing to changing of place 

 names, we found the outcrop from which the crinoids must have been 



