514 GEOLOGY OF OHIO. 



" Nevertheless, the transition is gradual and almost imperceptible. 

 The following are a few of the species which substantiate the identity 

 with the Kinderhook. (It should be observed that the fossils of the 

 lower sandy portions of the Burlington have been referred to the Kinder 

 hook, hence quite a number of so-called Kinderhook species occur in our 

 division III.) Conocardium pitlchellum, Nucula iowensis, Sangiri7iolites 

 rigida, Spathella ventricosa, Mytilarca fibristriata (below) Dexiobia ovata 

 Syringothyris sp., Edmondia burlingtonensis, Goniatites lyoni, Murchis- 

 onia quadricincta, Bellerophon cyrtolites, Prodttctus arcuatus, P. Skumardi- 

 anus, Chonetes logani, etc." 



In Scioto county, where conglomerate II is wanting, the shale, with 

 Sanguinoliles obliqzcus and Prothyris meeki, occupies the same position 

 as at Loudonville or Rushville. 



Division III — Burlington and Keokuk. 



Although for a long time laboring under the mistaken notion that a 

 part of the Cuyahoga shales in the northern tier of counties represents 

 the Logan, the personal study of the region has convinced us that the 

 stratigraphical conclusions of Professor Orton are borne out by paleon- 

 tology. As stated in the 1890 meeting of the Geological Society of Amer- 

 ica, "Mr. Cooper and I have traced the limits of division II by means of 

 the conglomerates and associated fossils along a line emerging from be- 

 neath the coal measures apparently not far from Seville, passing between 

 Wooster and Burbank, southeast of Ashland, west of Independence, west 

 of Granville and Newark, east of Lancaster and west of* Rushville to the 

 Ohio river near Buena Vista." The horizon of the second conglomerate 

 is at about the level of the track of the Cleveland, Akron & Columbus 

 R. R. near Holmesville and is about 200 feet above the river at Scioto- 

 ville. A fossil characteristic of the strata somewhat above conglomerate 

 II is the small Productus identified as P. arcuattcs. This is quite con- 

 stant and serves as an excellent approximate guide. The 150-200 feet 

 which follow are quite homogeneous in appearance and the faunal suc- 

 cession is so gradual that it is difficult to fix upon any basis for subdivision 

 though the uppermost layers contain an interesting fauna as yet but little 

 studied. This series attains its maximum thickness along the Ohio river. 

 West of Portsmouth about 250 feet of shales and flags occur above con- 

 glomerate II. The fossils which are characteristic of the lower part of 

 the series are Spirifer striatiformis, Crenipecten crenistriaius, C. gra?ivill- 

 ensis, Grammy sia ovata, Limatula ohioensis, Macrodon newarkensis, Schiz- 

 odus newarkensis, Productus burlingtonensis, P. arcuatus, and many others 

 as yet insufficiently studied. The general habitus of the fauna resembles 

 that of the Burlington group while a few species seem to be identical. 

 From the upper portions of this series all traces of the Kinderhook fauna 

 have disappeared. 



