276 GENERAL GEOLOGY. 



A llorisma , Edmondia (?) Avioulojpecten reotila- 



teraria. 



Immediately below this layer a thin band of indnrated clay 

 charged with the same fossils enumerated above, occurs at 

 some localities. 



14&. Four to six inch band, like preceding ; charac- 

 terized by the great abundance of Martinia planoconvexa ; 

 also, the following forms are known from this layer : Fusulina 

 rare, Zaphrentis (Sp. ?) crinoidal remains, Productus muricatus, 

 P. JYebrascensis, Chonetes mesoloba, Pemipronites crassus (?) 



Bhynchonella , Athyris subtiiita, Spirifer cameratus, Pleu- 



rotomaria , Macrocheilus . 



14c. is very tough, even bedded gray limestone, eight 

 to ten inches thick. It does not constitute a persistent 

 member of the bed, and has been observed at only a few 

 localities on the South and Middle Raccoon rivers, in Dallas 

 county; it here presents a layer largely composed of com- 

 minuted organic remains. The shelly surfaces of the layer 

 are crowded with one or two species of minute Gasteropoda, 

 and myriads of the exuvise of a minute crustacean, Cy there 



, besides Myalina , Aviculopecten rectilateraria, 



JVucula, (?) (sp. f), Productus muricatus, Qhonetes mesoloba, 

 Athyris subtilita. 



No. 15. Mottled reddish and yellow shales, eight to ten 

 feet. 



No. 16. Wheeler coal; twelve to fifteen inches. This bed 

 is not persistent nor does it appear to be widely distributed. 

 In the northern portion of the Middle coal area it has not 

 been recognized. In the southern portion of Warren county, 

 on Otter creek, on the Whitebreast, near Wheeler's mill, 

 and on a tributary of Cedar creek, near Col. Walker's, in 

 Lucas county, this coal is well exposed in connection with 

 the underlying strata, including No. 8, or the Panora coal. 

 The quality of the coal is average. 



No. 17. Shales, blue and yellow, slightly gritty with 

 nodules above; five to ten feet. 



No. 18. Sandstone, grayish-yellow, soft, sometimes 



