Art. III.] Carney, Geology of Perry Township. 121 



taining dip we were guided usually by the contact with overly- 

 ing Logan. The eastern dip which is lower in Perry township 

 than a few miles west may be due to proximity to the axis of 

 the Claylick anticline.^ 



3. Logan Formation. The greatest thickness of the 

 Logan, measured in the southern part of the township, is about 

 120 feet ; this formation also appears to thin northward. In 

 texture the Logan here accords with the descriptions found in 

 the literature.- It was noted, however, that in the upper lay- 

 ers many ironstone concretions appear ; in two localities thin 

 beds of ferruginous shale outcrop. 



When the overlying Pottsville does not appear in the usu- 

 al coarse conglomerate phase, its contact with the Logan is not 

 sharp. In ascending a section of the Logan, the presence of 

 nodulary iron masses denotes proximity to the Sharon member 

 of the Pottsville. 



On the hill road running northwest from Perryton is 

 found perhaps the most accessible section of the Logan in 

 the township. Here it is 79 feet thick, aneroid measure- 

 ment, the top of the Black Hand being found at the first house 

 to the north after descending the west slope No stream-made 

 section of the Logan was noted ; but it is surface rock along 

 nearly all highways leading away from the Wakatomaka valley. 



4. Pottsville Formation. Commencing with the Shar- 

 on conglomerate overlying the Logan, we have measured 223 

 feet of Pottsville. In ascending order the formation may be de- 

 scribed thus: A conglomerate, locally called "peanut stone," 

 with quartzite and other pebbles sometimes very coarse ; in 

 northwest part of the township near the Rocky Fork, conglom- 

 erate units weighing about two and one-half pounds were found. 

 Fire clay overlain by shale beds frequently carbonaceous follows; 

 then come sand and shale layers with iron nodules followed oft- 

 en by white micaceous sandstone. In one place, on the farm 



'Bull. Sci. Lab. Denison Univ., vol. iii, p. 24. 



■■'Prosser. Jour. Geol. vol. ix, 1901, pp. 230-231. 



Andrews. Geol. Surv. Ohio, Rept. Prog. (1S69), Part II. p. 76. 



