396 GEOLOGY OF OHIO. 
waters of Bird’s Run. The ore is hauled out to the railroad at Post 
Boy Station, and is consequently known to many as Post Boy ore. This 
basin was originally one of the largest of the field, as will be seen by 
inspection of the map (see page 392). Bird’s Run and its minor tribu- 
taries have dissected it into ten separate but closely contiguous frag- 
ments. | 
The general thickness of the ore, so far as it has been mined, 
ranges between 5 and 6 feet. It is not as rich in iron as some other 
bodies of the blackband, but it is highly approved in use. The Dover 
Furnace Company owns a large tract of it, and most of the remainder 
belongs to John Booth. 
The interval between the Middle Kittanning coal (No. 6) and the 
blackband, at this point, is 143 feet, as shown in a single measurement. 
The average composition of the ore of the Bird Run field is shown 
in the following analysis: 
Brrp Run BLAcKBAND—JOHN Bootn’s Minn. (Lord.) 
Sila ernie tee he coe sekaak ee deme ee eieetenelos tects: saeco toda ten omen 11.89 
Tron SOSQUIOKIGG pc bea sans deedasd sccuiswesesie ceoden disaldeaeadetaaeetsewacdorcemecte st 2.00 
T¥ON: CAF DONATE cccsiisecssccseescceian doses coaceescoucedeucinceeeeenseneeonse: Dee cele 52.61 
AVUMIN Gs. cisescses see daseccsslodsaceclssstans cascascceceocelcanss causes decectems ccc enue 6.04 
Dime Carbonate cose sree eee ee eee eee ee ee Ee 2.57 
Mapnesia Carbonate :scc.iieccseenc set cesecs oeotoct te neeconcoebinesiecumeceocceers 2.72 
Oxide of ‘Manganese iin cecssstcosicceeeetethwnedetestesvecsdedcuees ween Bonsapanse 0.60 
ROLLY) CBI? 6.554306600600008 005000 00000000000000 Jods voeeniNuisfecuamoleomsh deareuciceet ese ceectens 1.08 
Phosphoric AG \. ccc02 sc eiasccegesewodetesesvascvesenscccsstteces ceeese east eases 0.451 
Volatile and combustible matter..................scsscscseccscescercccscsceces 18.94 
MOistline ec cccccniees deck ccesedesesesceecsecet ddatvesledetochsecomeereseeegseccnsoeness 1.12 
Total 3.52 ccSatsccossibacde tale tage cescot aeenaonentascteeeek seme sncerees 100.02 
Metallic: iron cccdies sete cascen sce cesces Lia sbi aisieo-g elon teeid Se isteins soma RNa eee 26.80 
Phosphorus: stern. cost stececsacecescese escscsessseaseceseessdsecsetsssnesse: seh nsscmes 0.196 
SY UU 0) SI bape pcan Auioon bonne cod BU DoAGOBUaA oGdbEGOBuES gaboodbsbaad Reneeiiiclawaaestnc ses 1.08 
The blackband deposit does not end abruptly with the Tuscarawas 
county line, but through northern Guernsey county, there is always a 
probability of more or less carbonate of iron being found above the 
Upper Freeport coal. These deposits have been examined in a number 
of instances by explorers for iron ore, but no valuable beds have yet 
been found. | 
