CAEBOXLFEEOrS SYSTEM:. 273 



horizon, affords Produdus cequicostafrus, Chonetes mesoloba. 

 Leda, [TolMa\ (sp. ?), Loxonema* (sp. ?), Bellerophon, (sj>. ?), 



all in a very imperfect state of preservation. 



Xo. 3. Shales, bluish and light colored, with ferruginous 

 layers, and s&ptaria in the upper part. This bed is well seen 

 on Coal creek, near Sandy ville, Warren county. It is 

 probably twenty to thirty feet thick. 



Xo. 4. Lacona coal. This bed is not persistent, although 

 it has been found at more or less distant localities. In the 

 northern portion of the formation, in Dallas comity, it shows 

 a thickness of about thirty inches; but on the Middle Eaccoon 

 river, below Panora, it is only ten inches thick. In the 

 southern part of Warren county it varies from ten inches t ) 

 two feet. In this region it is sometimes accompanied by 

 more or less calcareous bituminous shales, containing Pro- 

 ductus ttquicosfatus, abundant, P. muricatus, Athyris 



suhf'lifa. Leda Idlastrkda. , ,* 



Loxonema, . . , BeUeroplion carbonaria. 



Hemipronites crassus, (f) Chonetes Verneuilianus, Nautilus 

 occidentaMs. The fossils in this bed are quite irregularly 

 distributed, usually occurring in colonies in excessive individ- 

 ual numbers, within limited areas. In quality, the coal is also 

 very variable, usually being charged with jyyrite and inter- 

 laminated with seams of shale. 



Xo. 5. Shales, blue and yellow; five to ten feet. 



Xo. 6. Bluish and gray, usually thin bedded and some- 

 times micaceous sandstone. This bed varies in thickness 

 from one to twelve feet. Its greatest development is seen at 

 Panora. in Guthrie county, where it has been passed through 

 in shafting for coal. To the southeastward, it is usually found 

 from one to five feet thick; though in Lucas county it may 

 thicken again, and is accompanied by a considerable thick- 

 ness of arenaceous shales, as seen on the Little WMtebreast. 



* Want of time for careful study of many of the species of fossils characterizing 

 these beds before the report must go to press, has prevented their identification with 

 sufficient precision to publish their names. Therefore, many species are represented 

 by only blank lines. 



35 



