478 C. R. STAUFFER 



Pleurotomaria planodor sails, Pleurotomaria rotalla, Orthoceras 

 sp., Bairdia devonica, Barchilina sp., Bollia sp., Primitiopsis 

 punctulifera, Bythocypris punclatus, Phacops rana, Fish plate 

 4. Shale, argillaceous, soft, blue. This shale contains numerous 

 small pyrite concretions, some of which are beautifully twinned 

 crystals. The fossils are probably rare in most of it and appear 

 to be in streaks or layers. Mostly covered io=>= o 



FAUNA 



Orbignyella monticula, Leiorhynchus laura, Spirifcr mucronatus, 

 Athyris spiriferoides 



3. Shale, blue, with pyritized fossils o 6=*= 



FAUNA (PYRITIZED) 



Leiorhynchus sp., Leda rostellata, Nuculites triqueler, Bactrites 

 arkonense, Tomoceras uniangulare 

 2. Shale, blue. Fossils rather abundant 3± o 



FAUNA 



Alveolites monroei, Aulopora cornuta, Aulopora serpens, Cerato- 

 pora rugosa, Zaphrentis prolifica, Spirorbis omphalodes, -Acan- 

 thoclema hamiltonense, Ascodictyon stellatum, Batostomella 

 obliqua, Fistulipora involvens, Fistulipora spinulifera, Hederella 

 canadensis, Hederella filiformis , Heteronema monroei, Orbignyella 

 monticula, Orbignyella tenera, Athyris spiriferoides, Chonetes coro- 

 natus, Chonetes dejlectus, Crania hamiltoniae, Cryptonella plani- 

 roslra, Cyrtina hamiltonensis, Leiorhynchus kelloggi, Phili- 

 dostrophia iowacnsis, Spirifer mucronatus, Stropheodonta demissa 

 Tropidoleptus carinatus, Styliolina fissurclla, Bairdia devonica, 

 Primitiopsis p unct ulifera 

 1. Shale, soft blue, with some flat calcareous concretions. Fossils 



rare 5 =*= o 



The other important Ohio outcrop is along the south branch 

 of Pipe Creek, one-fourth mile east of Bloomville and about three 

 miles west of the one just given on Plum Creek. At that point 

 the Prout limestone has been quarried to a limited extent, and is 

 therefore well exposed, although the beds of shale below are pretty 

 well sodded over. 



Section of the Hamilton beds along south branch of Pipe Creek 



Widder Thickness 



Beds Ft. In. 



4. Prout or Encrinal limestone. An impure blue limestone some 

 layers of which are very crinoidal and the upper one containing 



rather numerous corals 9 o 



