94 aia ANNUAL REPORT 
This would of itself be of no great importance, but its proximity 
to the great Ferriferous limestone areas, where 94 per cent. lime is avail- 
able, makes it worth considering as a source of the silica and alumina 
needed for the cement. The silica, being in the amorphous form, and 
mixed with its own lime, would make it ideal for that purpose. 
At Albany, Athens county, the same horizon, or possibly the Free- 
port, furnishes a 7-foot 6-inch ledge of stone of the following composition : 
Per Cent. 
Roy Kee: Iaprae SretirS Anca TI NE cL RI EAE etn pect RIEL REINER we ai MISA elle 50.30 
PANN hoon bay bana te NOUN ie U MLSE RNAS RNa a Leia cal A SLL La 5.46 
Hernrel Oxi espera vis shat neni rays ans seinen Seti ae ana ee Dalai 20 
Calciumercarvonate rere ciwuok ela riae ew tener cerned 40.91 
Macnesiumyecarbonate) san oncri sc yaar seven cea ieee 1.36 
99.23 
Here again the stone would be available as a mixture, but not by 
itself. 
Crinoidal.—The Ames or Crinoidal limestone, located about 100 feet 
above the Cambridge and approximately 100 feet below the Pittsburg 
coal, is in general much like the Cambridge in its general character and 
occurrence. It is usually thin and worthless, except as a stratigraphical 
guide, in which its persistence and fossiliferous character make it of great 
value. In one area only, viz., west and southwest of Wellsville, Colum- 
biana county, extending into the northern part of Jefferson county, is the 
Ames or Crinoidal thick enough to be of interest. A few square miles 
of country shows it there in ledges of from 6 to 8 feet thick. The fol- 
lowing sample, taken near Wellsville, shows what may be obtained: 
Per Cent. 
ho) UOLC: ae ML MER TOL CR Rae un MMe Oot Nara ethno at 6.50 
JANI Wb UA 0UN a2 pee AnUMER URRY ae aut geal ais aN SE aa err ed LADEN yon E- 1.87 
INET TIC ORV S sae er yee See eee asd Lae Ne Oo ean Ot a Hn 0.71 
Carbonateloticalciumi See ee 87.90 
Carbonatelotemacnesiumeney nin ried ie ere eee 1.20 
98.18 
The large limestone deposits of the coal measures are found above the 
Crinoidal limestone, but in horizons of very uncertain and fluctuating char- 
acter. | 
Pittsburg.—These limestones begin occurring at a point about 50 feet 
above the Crinoidal limestone, or about an equal distance below the Pitts- 
burg coal. This horizon furnishes what is called the Pittsburg limestone in 
some places. Passing upwards, another well developed calcareous belt 
occurs just under the Pittsburg coal, and another immediately over. The 
upper one is frequently spread out over 50 feet or more of strata. In fact, 
