34 KENTUCKY GEOLOGICAL SURVEY. 



they have still something of this character, but are reduced in 

 thickness. Almost no exposures of any consequence were met 

 farther south, but, it is probable that they change materially 

 and 'they may no.t be distinguishable from the overlying layers. 

 The Monficulipora mclexta Nicholson (=3Ionticulipora mam- 

 mulata D'Orbigny, probably) is very common in these beds 

 at Cincinnati and at Maysville. It is not restricted to thoj 

 Bellevue for it occurs rather rarely, as a. somewhat massive 

 form, in the lower part of the Fairmount (it is to this form that 

 the name J/. mammulata has been supposed to belong), and in 

 the upper part of the Fairmount rather abundantly as a fron- 

 descent form. 



CORRYVILLE BEDS. The highest hills back of Covington are 

 probably crowned by the lowest layers of these beds, but they 

 are seldom exposed here. They have been studied chiefly at 

 Cincinnati where they are very fossil if erous. At Maysville 

 they are much less so, while near Richmond, Ky., they are de- 

 cidedly barren in large part. Here also they are in part cherty. 

 On the east side of the anticline the only exposures seen were- 

 in the Maysville section and near Richmond. On the west side, 

 exposures, showing only a few feet vertically, were seen in Bul- 

 litt county, near High Grove; in Washington county east of 

 Frederlcktown ; at Springfield; and near Lebanon. The fossils 

 collected have not yet been examined. 



MOUNT AUBURX BEDS. The large brachiopod Platystrophia 

 lynx characterizes these beds 1 in Ohio. There they have a thick- 

 ness of about 20 feet. They are less regularly bedded than the 

 underlying Corryville or the overlying Arnheim. In exposures 

 they present a somewhat scraggy appearance. They cap the 

 highest hills around Cincinnati, but on the south side of tihe 

 Ohio river they have been entirely removed by erosion. They 

 are found on both east and west sides of the anticline in Ken- 

 tucky, and present about the same appearance as in Ohio and 

 Indiana. The fauna has the same general aspect in all these 



