HOCKING VALLEY. 713 
No. 2, Shawnee limestone, by Gregory. 
No. 3, top layer Cambridge limestone, Moxahala, by Gregory. 
No. 4, bottom layer Cambridge limestone, Moxahala, by Gregory. 
No. 5, bottom layer Cambridge limestone, Moxahala, by Gregory. 
2 3. 4 5 
Silicawereeeemeeee cece cicecacccs snot eect esemmce ely LOL 8.75 7.3¢ | 10.57 
ORXIGSROHATON G2 eee ae IS Seer So, Sou ue aioe Siok od TA Sy ed Ps ete sexes is re 
Carbonate; Ofplront. Veni co woe hw, Se eed oem climes Sy Das re 3.31 20.45 
Alumina and phosphoric acid..................----- 3.03 1.88 0.30 0.51 
Carbonate of manganese ..........--.-------..----- OBA ac eee O:4 oi ewes stb 
HO xd OVO MANGANESE! si ccate ss ccyelee Sie aytcle\ciea es eieis!Selcis [uae e ss LU oy: espe ae 3.40 
Carbonate of magnesia... ....-.-.--..----.--------- 6.16 0.65 0.68 0.11 
Carbonatelofelime)_e cesses se dooce ceciece cesses O2-300) » 60.76) 1) 66:86) ||) 765,06 
Wit Corian Gerona ene Reese Searels Se eS Seah rare ers LET eete. eel a 
Mo Gaull ear my peeyee eee apres wey Taras ea es may nis ata lerapenicee ta oreo fercicis 47.9) Wns aie hl Sareea 
FIRE-CLAY. 
Fire-clays of the ordinary character of the Coal Measure clays are 
abundant everywhere, forming the bed of the coals and of many of the 
ores. A specimen of excellent non-plastic fire-clay, similar to that at 
Mineral Point, Tuscarawas county, has been shown me, as obtained in 
the north-east part of Ward township, below the Great Vein. I was not 
able to find the locality. 
But a non-plastic clay of good quality is mined at Logan, and used 
extensively in the manufacture of fire brick by the Wassall Fire Clay 
Company, of Columbus. It is three fect thick, and is much like the 
Mineral Point Clay. 
BUILDING STONE. 
None of the massive sandstones seem to be persistent over the whole 
field. That above No. 6, the Mahoning, is the most so, and in places is 
a fine quarry rock. It is often loosely cemented, and decomposes on ex- 
posure into sand. In many places, however, it affords good building 
stone. And on almost every hill-side, some where in the exposed section, 
. strong and durable building stone crops out. : 
SALT. 
A large number of wells have been bored for salt in the valley of Sun- 
day Creek and other parts of this field, and a strong brine uniformly 
obtained at a depth of from four hundred and fifty to five hundred feet 
below the Great Vein Coal. The construction of canals and railroads 
compelled the abandonment of all works at a distance from these means 
of communication. The brine is evidently on the same horizon as that 
