744 GEOLOGY OF OHIO. 



sections at Freeman Bros., Elliotsville, Croxon's Run and Sloan Station, 

 indicate that the limestone coal of Elliotsville is No. 5, here widely 

 separated from the underlying coals, and a local coal seam coming in to 

 occupy the middle of the interval. Possibly further observations will 

 prove this conclusion wrong, but it is the only logical inference from the 

 facts now before us. If we were to suppose the limestone coal at Elliots- 

 ville to be No 6, we should then have another difficulty in the interval 

 of 100 feet, which separates that from Coal No. 7, which is nearly twice 

 the average distance in this region. Another fact that argues in favor 

 of the coal in question being No. 5, is that 30 feet above it is a hard, non- 

 plastic fire-clay, which is found in most of the sections along the river. 

 At Smith's Ferry it is helow Coal No. 6, and at Sloan's Station it lies 

 above the " Limestone Coal " which is here only 62 feet from No. 4, and 

 midway between that and Coal No. 7. The intervals are there all di- 

 minished as will be seen when the notes on that locality are reached. 

 At Elliotsville the local geology has been quite carefully studied by Dr. 

 Wilmot Garlick, and the members of the Geological Corps have at differ- 

 ent times received much assistance and many courtesies from him, and 

 his father, Dr. T. Garlick. 



The following section was taken at Elliotsville : 



1. Shalysandstones reported to contain near top a coal 3 to 4 



feet in thickness 150 feet. 



2. Coal, thin. 



3. Fire-clay and shale, used for pottery 3 feet. 



4. Coal, thin 3 inches. 



5. Fire-clay and shale 35 feet. 



6. Coal No. 7, hard and clean 3 feet 8 inches. 



7. Shale sandstone and covered 66 feet. 



8. Hard clay, changing gradually into shale above and be- 



low, reported 8 feet. 



9. Shales and shaly sandstones 26 feet. 



10. Coal No. 5, soft and smutty 3 feet 2 inches. 



11. Fire-clay 6 inches. 



12. Limestone 3 feet. 



13. Sandstone and shales, with a line of springs near the 



middle 85 feet. 



14. Coal No. 4 18 inches. 



15. Fire-clay and gray shales, with nodules of iron 25 feet. 



16. CoalNo. 3 2^ to 3 feet. 



17. Fire-clay, used in pottery 8 feet. 



18. Hard, blue, argillaceous sandstone, with mica, to river. 



The exposures of the strata between the coals is not very good, but all 

 the coal seams enumerated above have been opened by Dr. Garlick. 

 The clay and argillaceous shales associated with the two thin coals (2 



