426 GEOLOGY OF OHIO. 
regular block ores and the Boggs ore. Their relations to each other 
and the general scale are shown in the following table, viz. : 
Franklia block ore—Upper Mercer limestone horizon. 
Intervallencitie, saat sacvencosdscseusoscsatusecsioenas A Seeecdsentaee Hailes 10 to 20 feet. 
Sandblock oré—Upper Mercer coal horizon? 
Tt ER Vall eens ss is ce ssucseonsecceate eae aoe eme doen eoec tee aan 25 to 35 feet. 
Little block ore—Lower Mercer limestone horizon. 
| ah 2) 127) Pane een TI or a Abe pn ah Aon d AO to 45 feet. 
Boggs ore—Horizon of Junction City block ore’? possibly 
Lower Mercer coal horizon ? 
The maximum interval between the upper and lower block ores is 
75 feet; the minimum is about 40 feet. 
The longest measurement found is on the lands formerly owned by 
Junior Furnace, but intervals of 60 feet are not unusual in the Ohio 
Valley. 
(2.) THe LimMesTONE GRouP oR MIDDLE Division oF OREs. 
There are only three worked ores in this division, but one of them, 
by itself, outweighs in value all the other ores of the field combined. 
The series is shown below: 
1. Limestone ore—Horizon of Ferriferous limestone. 
Intervalle is... ccth nsnsseicaneanoesonmecsduewers tones eecece eee ncnanes 15 to 25 feet. 
2. Limestone kidney—Upper or Little kidney, Canary ore of 
Vernon township, ete. 
Intervals Jescswais detetestaansekioce aecenamasmaeron aceon saceeaaeeerrnene 15 to 25 feet. 
3. Limestone kidney—Lower or Main seam, horizon of Put- 
nam Hill limestone. 
leatrerAAll WO IOAN JOYE WIRD orand0 060000000000060000 000000000 70 feet. 
This sevies takes in the strata above the Franklin block ore to the 
Ferriferous limestone, including the latter. In vertical measurement, 
it almost always exceeds 100 feet. A few of the measured intervals 
are given below: 
Intervals. 
At LrOnton: ci ccececocheoelth ogceotaiscles dues Weoe's tie gale soe ele ee cieeceyaee anime cen ae wentaeeaere 107 feet. 
At Lawrence: Furnaces sce. cise. cicacty asdessestaesaaceieesaciaseeiaieee centers 103 to 115 “ 
At Genter Furnace ssicccsseese secs sates cscs ccloteosutaeosadagscm ee ratiac tens doseeetoce 108 ‘“ 
APOHIO*HOMNACE Ee eeseren seececece cect ccennsses tesmccoueeemuce ronenoees 102 to 115 “ 
In section 23, Vernon township, Scioto county...............ccesseeeeeeeees 133“ 
At Bloom Furnace isccsictecteccccuoses ce coceceol eve ccsecsewce b ecdastlacs seat eae Se 
In section 36, Lick township, Jackson COUNLY................0sesseeeeeseeeee 100 ‘ 
In section 34, Swan township, Vinton county .............cccsccereseessceeee 100 “ 
Tony, SEO SAV? GORVALINZ 200060000 000000000000000000 00000000000 panseaddcneseGleewers about 70 “ 
