150 



SCIENCE. 



[N. S. Vol. XXII. No. 553. 



ical provinces essentially distinct. Now, a 

 study of the fossil lists given by Nickles in 

 his ' Geology of Cincinnati ' indicates that the 

 rocks at Cincinnati identified as Lorraine and 

 Utica contain faunae so different from the 

 typical Lorraine and Utica faunas of New 

 York as to warrant the application of the 

 Ij principle above stated. For this reason the 

 : name Maysville is here suggested for the strata 

 ' at Cincinnati hitherto identified as Lorraine. 

 Along the railroad south of Maysville, Ken- 

 tucky, from the first cut a little over a mile 

 from town to the overhead bridge a mile north 

 of Summit ^ magnificent series of exposures 

 1^1 gives a complete section of all the subdivisions 

 / of the Maysville division, from the Mount 

 Hope bed to the top of the bed formerly known 

 as Warren. The name Eden, well defined by 

 Orton in the first volume of the ' Geology of 

 Ohio,' published in 1873, is revived for the 

 strata which in the ' Geology of Cincinnati ' 

 are identified as Utica. Whether the clay 

 bed, four or five feet thick, containing Triar- 

 thrus hecki, at the base of the Eden division 

 should be included in the Eden or not, is a 

 question which requires further study. On 

 the supposition that Triarthrus hecJci proves 

 this clay layer to be of the same age as the 

 Utica of New York, and that the Eden beds 

 represent a later stage of deposition than the 

 Utica of New York, the clay bed containing 

 Triarthrus heclci should be excluded from the 

 Eden division. The writer, however, is not 

 prepared to assert that the clay bed in ques- 

 tion is the only representative at Cincinnati 

 of the considerable thickness of black shales 

 struck in the gas and oil wells of northern 

 Ohio, and there identified as Utica. Never- 

 theless, it may be convenient to have a name 

 for the Triarthrus horizon, and the name Ful- 

 ton layer is here adopted, not because Fulton 

 presents the best exposures, but because the 

 names of the other localities at which this 

 horizon occurs are already in use. Eulton 

 was formerly a suburb of Cincinnati, and now 

 forms part of the First Ward." The other 

 localities are in Taylors Creek, east of New- 

 port; at the quarry along the railroad, about 

 ' ' Geology of Cincinnati,' p. 55. 



half a mile southeast of New Richmond, Ky.; 

 and at Point Pleasant, 0. 



Several changes in nomenclature appear 

 advisable on account of a second practise, 

 which has become more imperative since the- 

 publication by Weeks, in 1902, of the ' North 

 American Geologic Formation Names.' This- 

 practise opposes the use of the same name for 

 different formations, even if widely separated 

 geographically and belonging to widely differ- 

 ent geological ages. In consequence the name- 

 Saluda was suggested in a paper on the Cin- 

 cinnati geanticline in southern Kentucky* in 

 place of Madison, and now the name Arnheim- 

 is proposed in place of Warren. This has the- 

 additional advantage of leading the investi- 

 gator to a type locality where the character- 

 istics of the formation can be well studied^ 

 Arnheim is a little village seven miles north- 

 east of Georgetown in Brown County, O., 

 and several miles east of the railroad from 

 Georgetown to Sardinia, but is easily reached 

 by good pikes. It makes up by the excellency 

 of the exposures for its somewhat inconvenient 

 location. The section begins a short distance' 

 south of town, at the Blue Banks, the first 

 steep exposure along Straight Creek. Here- 

 the base of the Waynesville bed is twenty-five- 

 feet above the level of the creek, and the top 

 of the Arnheim bed consists of the nodular 

 clay layer so characteristic of the exposures- 

 of this bed in Warren County, O. The base- 

 of the Arnheim bed is a considerable distance 

 down the stream, where it rests upon the top- 

 of the Mount Auburn bed, which contains an 

 abundance of Platystrophia lynx at the top. 

 The thickness of the Arnheim bed is estimated 

 approximately at sixty-three feet. 



In attempting to trace the Liberty and 

 Whitewater beds in Indiana, the writer found 

 great difficulty in separating these beds at any 

 considerable distance from the type localities; 

 for instance, at Madison, Indiana, and thence- 

 southward. For this reason it has seemed 

 convenient to have a name for this part of the 

 Richmond section, the Middle Richmond, 

 when it is not found practicable readily to 

 distinguish the smaller divisions. The name 

 Versailles hed is here proposed. Along the 



*Am. Geol., 1902. 



