415 
thin. These sinks connecting with under-channels are the sources of many 
springs that abound in and at the borders of the region. 
Chester Group. On the high hills at the borders of the Flatwoods 
region shales and shaley sandstones overlie the Mitcheli. These are usually 
about twenty-five feet thick, and upon them is a limestone usually about 
three feet thick in the Flatwoods exposures. This group is known as the 
First, or Lower Chester. On top of the First Chester limestone occur a 
series of shales and sandstones, consisting of a portion of the Second 
Chester group. This group is capped by a limestone, its last member. At 
no place in the immediate vicinity of Flatwoods was the top of the Second 
Chester found. 
The above general outlined stratigraphy is found in the Flatwoods 
region and portions directly connected with it. Some attention now will 
be given to local details. 
The general dip of the rock of the Bloomington Quadrangle, in which 
a portion of Flatwoods occurs, is on the average twenty feet to the mile to 
the west, southwest. In regard to the dip of the rock structure in the 
Flatwoods region, the following data reveal an interesting feature: 
Contract of Mitchell and First Chester, south side Flatwoods: 
In 920-foot hill, N. W..4, sec. 16,T.9N., R.2W........ FE sereke = 870 
Vira BLO. Osataxore LWW ISS Si a Skee. “Uy UDA OY IS TRON es Poe 845 
Ud Wve TORN Cat ToUMUl The WAYS Fe, SVG, GID MO) IN hate DOE ae ee $20 
LiNaGeNLELeVOLs Sees ISCC west OINesab te SfiWWitis ac hedak vam eo ok Sete 800 
OnehaliemnilerNe oh, aboverra-rce ec kt ce oes es ee ae 805 
SO \Wio SUGKE Cie Lawl WS IDS Fe rex, TE GINS, et, 8) Ving ole ann peo oes 800 
MAddIGRNE OLN Weer SCCa oa lle GuNE warm Wie selene siete cen rs 720 
North side of Flatwoods: 
Imysi10-foot hilly Middle sec; 30; 1 10) N:, R. 2 W....<-...--.- 790 
Chambers Hill, middle of line, sec. 24-25, T. 10 N., R.3 W..... 810 
The data along the southern side of Flatwoods reveals an average dip 
of thirty-feet to the mile along a line which is as much in the direction of 
the strike as in the direction of the dip. Again, going from the eastern con- 
tacts toward the western, the data indicates that the first two-thirds of the 
distance has a dip of twenty feet to the mile, and the ramaining distance a 
dip of fifty feet to the mile. The data on the north side is very meagre, as 
there are only a few hills high enough to reach the Mitchell and Chester 
