The middle Huron limestone is usually a close-textured, semi-crystal- 
line, gray fossiliferous limestone which varies in thickness from 5 to 30 
feet; averaging about 16 feet. ©. . = . . 
The upper limestone averages about 15 feet in thickness, is more nearly 
crystalline in structure, varies from dark to light gray in color, and con- 
tains many crinoid stems and bryozoa. It takes a fine polish and resembles 
marble when so treated, but does not hold its polish when exposed to the 
atmosphere. 
The general section in the area under discussion is: 
10—Shale and sandstone of Pennsylvanian age, which is uncon- 
formable on the beds below. ITIIuron (Chester) Group. 
¥t. 
Upper )—Limestone and shale, calcareous, grading from 
limestone. breeciated limestone at bottem to shale at top; 
limestone composed largely of bryozoa with few 
foraminifera; locally Known as marble....9...... 20 
Upper S—-Sandstone, a heavy bed of ferruginous, reddish, brown, 
sandstone. or white, hard or .soft. amimdted! <2... es Syasereneag 40 
Middle 7—Limestone, crystalline, generally light colored, oc- 
l'mestone. casionally. odjitie, foraminiferal: .....\-:. casi. apis 6-21 
Middle 6-—-Shale. argillsceous or arenaceous, weathers red in 
sandstone. TVA GES SS tte nite A a ates cli naie oy. BE 1.09) «ok a6) ae 20-25 
5——-Sandstone, similar to upper, except much more cross- 
FOE LL ey ceceee chores Oo ete h atic erg Sinn. ba eo dv ee eee 25 
4—— Shale Gark:, Dituminons....%. sieie a eye ole > Getter 0-12 
Lower 3—Limestone, thin bedded, odlitie or lithographic....... 2-5 
limestone. 
Lower 2— Shale; arenaceous or sandstone: ......6.s.52.+ +608 4-12 
sandstone. Mitchell limestone. 
1—Limestone, white, finely odlitic. 
SUMMARY OF PREVIOUS WORK. 
Cox. in a report on the geology of Greene County’, says: 
“Sub-Carbonferous Limestone.—At the mouth of Fish Creek, in the 
northern part of the county. limestone belonging to the Chester group of 
the sub-earboniferous formation, outcrops in the bluff bank of the creek, 
and is exposed to the depth of 15 to 20 feet, and is at this place overlaid by 
drift, but at a short distance to the southwest it is increased by the addi- 
1st Ann. Rept. Geol. Suryey Ind., 1869, p. S87. 
