278 GE3STERAL GEOLOGY. 



No. 23. Soft, shaly, gray, micaceous sandstone; 2 feet; 

 five miles below Panora on the Middle Raccoon. This bed 

 presents the unusual thickness of seven to ten feet. It affords 

 the following fossils: Polyzoa, Productus mquicostatus, 



Hemipronites crassus. (?), Myalina , Pleurotomaria 



, Cladodus, (?) (sp. ?) 



No. 24. Chocolate-colored and blue, slightly arenaceous 

 shales, with nodules at base; ten to fifteen feet. 



No. 25. Gray sandstone, irregular, passing upwards into 

 mottled blue, gray, and chocolate-colored, slightly arenaceous 

 shales, with nodular layers; five to ten feet. Near the top in 

 a thin band of dark shale a few fossils are found — Petrodus 



and spines, Ganoid scales, Piscina , Martinia, plano- 



convexa. 



No. 26. Dark-buff, fragmentary, argillaceous limestone; 

 two to five feet. 



No. 27. Shales, blue, sometimes red; local; four feet. 



No. 28. Indurated, gray, calcareous shales; one foot. A 

 local deposit seen at Van Meter's mills, and near Adel, Dallas 

 County, contains Productus muricatus, P. osquico status, 

 CJionetes mesoloba, Hemipronites crassus, (?) Martinia plano- 



conmxa, Atliyris subtilita, Myalina, , Edmondia (?) 



, Pleurotomaria 



No. 29. Bituminous, fissile shales, local ; one foot. This 

 bed is also present at the localities mentioned in connection 

 with the last preceding bed. In the vicinity of Hammonds- 

 burg, Warren county, a half-inch seam of coal occurs at the 

 bottom of this bed. The shales have afforded Petrodus and 



spines, ganoid scales, Amculopecten , Spiriferina, 



Kentuckensis, Rhynclionella , Productus muricatus, 



Lingula . 



No. 30. Blue and purple shales, with irregular indurated 

 and nodular bands ; five to twelve feet. 



No. 31. Bluish gray or buff, soft, impure limestone, more 

 or less regularly bedded ; two feet. The bed is sometimes 

 separated in two layers, and at some localities it has, 

 associated with it, several thin, fossiliferous layers, as may 



