502 . GEOLOGY OF OHIO. 



which burrowing mollusks thrived, and later, in shore-lines kept supplied 

 with pebbles by re-invigorated rivers. When the sea next returned it 

 was with its freight of Carboniferous forms, but the old Chemung species 

 had chiefly perished during the slight oscillation. Comparatively few 

 deep-sea forms accommodated themselves to the littoral conditions for 

 some time, but such as did are related to Burlington or Keokuk species, 

 which formations were then accumulating to the westward." 



In this paper, by a curious mistake, the word "Berea" is included in 

 a table on page 26 at the level of the Licking county freestones (Kinder- 

 hook) and has given rise to some misconception. In December of the 

 same year the concluding portion of the same paper appeared, complet- 

 ing the list of fossils and summing up the evidence then at command. 

 About forty species regarded as new were described and most of the 

 forms mentioned were figured. A few cursory collections in the upper- 

 most layers at Cuyahoga Falls led to the suspicion that there existed a 

 thin band of shales belonging to horizon of division III. This opinion 

 was materially strengthened by the report of Mr. E. O. Ulrich which 

 appeared in the fourth volume of the Bulletin of Denison University. 

 In his own words, "The bryozoa are thus decidedly indicative of an 

 equivalence between the Cuyahoga shales on one hand and the Keokuk 

 group on the other." 



We noted the fact that "an almost entire change in fauna appears a 

 mile or two below Cuyahoga Falls and there is little in common between 

 the upper shales and those below the flags forming the second falls of 

 the Cuyahoga. Subsequent observation has served to emphasize the 

 last statement, but renders it improbable that there is any considerable 

 representation of division III in the typical Cuyahoga as exposed at the 

 falls of that name. It was sufficient to attract attention to discover, by 

 a„moije careful examination of Mr. Ulrich's list, that a number of identi- 

 cal species occur in the Cuyahoga shales at the Falls and at Bagdad, 

 Richfield an^Xodr^sis well as in the shales at Moot's run in Licking 

 county, the position of which was well known to be near the base of the 

 Waverly. An abundant fauna, with a strong Devonian facies, was found at 

 this horizon. Glancing at the list of bryozoa we find twenty-four species 

 not previously described. Fenestella aperta, F. tenax and F. burling- 

 tonensis were recognized on admittedly imperfect material while the form 

 identified with F. regalis was thought possibly varietally distinct from 

 the Keokuk type. Similarly with the other genera; many of the species 

 may have a wide vertical range and others of those compared to Keokuk 

 species are not well preserved. Glyptopora megastoma, if associated 

 with Spiri/er striatiformis at Sciotoville, is from a horizon comparable 

 with the Burlington. Thus it appears that the evidence for che Keokuk 

 age of the Cuyahoga is less convincing than was at first supposed. ' In a 

 subsequent visit to these northern localities the calcareous concretionary 

 layer which has yielded so abundant a fauna in central Ohio, was discov- 

 ered at a distance of forty feet beneath the coal-measure conglomerate 



