K B. Andrews on Carhonifen 



For several years I have suspected that a certain limestone 

 in southeastern Ohio should be classed with those of the Lower 

 Carboniferous limestones. The supposition was entirely con- 

 trary to the "traditions of the elders," and furthermore, the 

 limestone was above the principal range of conglomerate which 

 has been ever regarded as true Coal-measure conglomerate. In 

 the prosecution of the Ohio Geological Survey, in the 2d dis- 

 trict, entrusted to me, I find that the conglomerate referred to 

 is a Waverly conglomerate ; that it is separated from the base 

 of the productive Coal-measures by an upper Waverly sand- 

 stone group, rich in fossils, which I have called the Logan 

 sandstone group, and that resting upon this group is, in many 

 places, a limestone, called the Maxvilk limestone, whicli is a 

 true Lower Carboniferous limestone. This limestone is not a 

 continuous deposit but has only a local development here and 

 there, always resting, however, upon the fine-grained Logan 

 sandstone group. It was deposited in quiet basins along a 

 uniform horizon. Generally, there is an iron ore adhering to 

 the top of the limestone. There is no evidence that the local 

 deposits were once continuous and united and were subse- 

 quently separated by erosion. The stratigraphical position of 

 the limestone and the contained fossils led me to suspect that 

 we had in it an Ohio representative of the Chester Hmestone of 

 the Illinois Repoits. This opinion has been confirmed. Prof. 

 F. B. Meek, now engaged in the study of our Ohio fossils, has 

 sent me the following report in regard to the fossils of the Max- 

 ville limestone : — 



" List of species and genera. 



1 . Zaphrentis. A small undetermined curved conical species. 



2. Scaphiocrinus decadactylus Hall ? Described from the Chester group. 



3. Productus pileifarmis UcChesnej. Described from t" ~ "^ 



by Mr. Davidson to be the same as P. cava d'Ort „ . 



4. Productus degans N. and P. Described from the Chester group, oome ui mo 



specimens may be the form Prof. McChesney described from the same hori- 

 lame P. fasdculatus. 



rom the Chester (Kaskaskia) group. 

 Tom the St Louis (Warsaw) group. 

 . Described from the Chester group. 

 ^ ^terhaps two species. 



10. Terebratula. An undetermiued, small oval species showing the fine punctures 



11. Aviculopecten. Undetermined species. . ^ „ 



12. Alhrisma. Undetermined fragments, apparently like A. antiqm SwaUow, 



described from the Chester group. 

 j^- Naticopsis. A small iindetermiced species. 

 14. Strapardlus perspectivus Swallow, sp. Probably a more elevated form of 6. 



