KENTUCKY GEOLOGICAL SURVEY. 29 



Maysville Group. 



The name Maysville is here used for that division of the Cin- 

 cinnatian to which the New York name Lorraine has been appli- 

 ed for several years past. The name is taken from Maysville 

 where a magnificent series of railroad cnts on the L. & N. be- 

 tween Maysville and the next station, Summit, presents a 

 complete section showing practically all the layers of 

 all the subdivisions. The Maysville in the area south 

 of the Ohio river on both the east and west sides) 

 of the Blue Grass basin is much less fossil if erous as a 

 whole than in the area north of the Ohio river. Lithologically 

 also there are considerable differences. There is little difficulty 

 however in recognizing the subdivisions which have been made 

 in Ohio. These subdivisions are here treated in ascending or- 

 der. 



In Ohio the brachiopod Rafinesquina alternate and its varie- 

 ties is perhaps the most abundant fossil of the Maysville, being 

 *ound in all subdivisions and also ranging through the Rich- 

 mond. The large Platijstrophia lynx occurs rather sparingly in 

 the Fairmount, B'ellevue arid Corryville, is exceedingly abundant 

 *n the Mount Auburn, and occurs at two or three horizons ita 

 the Arnheim beds. In Kentucky, the Rofine&quina, Avhile rather 

 abundant at some horizons, is on the whole an uncommon fossil, 

 while the large Platystropliia lynx occurs abundantly in all 

 the Maysville formations, and is frequently the most abundant 

 fossil. Here as well as in the northern area, it occurs in the 

 greatest profusion in the Mount Auburn beds. The Zygospira 

 modest a is found everywhere in the Maysville. 



As the bryozoa of the Maysville group in Kentucky have not! 

 yet been thoroughly investigated, it may be of value to give a list 

 of the described species of bryozoa which have been recorded 

 from the three States of Ohio, Indiana and Kentucky. Nearly 

 as many undescribed species are known as have been described: 



