KENTUCKY GEOLOGICAL SURVEY. 35 



areas, with about the same elements, though the bryozoa pre- 

 sent species in each of the areas not found in the others. The 

 Platystrophla lynx, in Kentucky as in Ohio and Indiana, is 

 more abundant in these beds than in any other subdivision of 

 the Maysville group. Quite a varied fauna has become known, 

 but it is still largely undescribed. 



The principal exposures seen on the east side of the anticline 

 were in the Maysville section; near Sunset in Fleming county; 

 and near Richmond: on the west side, in Spencer county, a 

 short distance north of High Grove; and at several points! in 

 the vicinity of Lebanon in Marion county. At these last ex- 

 posures the Mount Auburn was overlain by Devonian lime- 

 stone. 



ARNHEIM BEDS. The name Warren was first applied to these 

 beds, as they form the surface rock to a large extent in Warren 

 county, Ohio, where they were first studied. As the name Warren 

 had been applied earlier to a Devonian formation in Pennsylva- 

 nia, Foerste has substituted the name Arnheirn from a locality in 

 Brown county, Ohio, where a good section can be studied. Blue 

 shales and limestone are the prevailing materials. The beds 

 have not been thoroughly studied yet, even in Ohio, and the 

 fauna is mostly undescribed. At one horizon, quite limited 

 vertically, but very extended horizontally, as shown by the large 

 number of localities in Ohio and Indiana from which it has 

 been reported, the Dinorthis carleyi Hall (usually, but in the 

 writer's opinion erroneously, considered a synonym for Dinor- 

 this retrorsa Salter) occurs. This fossil has not yet been found 

 :'n Kentucky, so far as our information goes, but it probably will 

 be. In Ohio the Arnheim beds have been reported to. be about* 

 80 feet thick. No opportunity offered for measuring their thick- 

 ness in Kentucky. In Ohio the upper few feet consist of a con- 

 cretionary, rubbly, indurated clay. In Kentucky the last few 

 feet are quite different and usually highly fossil if erous, Batos- 

 toma varlans is a common form both in Kentuckv and Ohio. 



