72 
IOWA ACADEMY OP SCIENCES. 
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STATION. 
60 
59 
58 
57 
56 
55 
54 
53 
53 
51 
50 
49 
48 
47 
46 
45 
44 
43 
43 
41 
40 
39 
38 
37 
36 
35 
34 
33 
33 
31 
30 
29 
28 
27 
26 
25 
24 
23 
Shale, lig-ht blue 
Shale, dark blue 
Limestone, compact, gray. 
Shale, gray 
Shale, light blue 
Shale, brown , 
Dolomite, brownish gray 
Dolomite, dark gray, coarse grained 
Dolomite, gray 
Dolomite, pinkish gray, coarse grained 
Dolomite, light brown, coarse grained 
Shale, dark, slightly petroliferous. 
Shale, dark, dolomitlc 
Dolomite, with some little chert 
Dolomite, gray 
Dolomite, white 
Sand, pinkish 
Sand, mixed with black shale 
Sand, clean, white, fine grained 
Sind, clean, white, coarse grained 
Sand, darker, coarse grained 
Dolomite, white, compact 
Dolomite, pink, compact 
Dolomite, pinkish gray, compact 
Dolomite, pinkish, compact 
Sand, rusty, with some lime and chert 
Sand, rusty 
Sand, very sharp grained 
Sand, fine grained 
Dolomite, white, compact 
Dolomite, with brownish shale 
Sand, mixed with limestone and chert 
Chert, white ; 
Sand, fine grained, with some shale and limestone 
Drillings wushed away 
Sand, blown, rusty 
Limestone and chert, whitish. 
Sand, limestone and chert 
Dolomite, grayish-brown 
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126 
275 
165 
440 
140 
580 
38 
618 
20 
638 
50 
688 
49 
737 
78 
815 
10 
825 
20 
845 
23 
868 
27 
895 
15 
910 
16 
926 
19 
945 
10 
955 
45 
1000 
40 
1040 
10 
1050 
15 
1065 
35 
1100 
180 
1280 
15 
1295 
40 
1335 
15 
1350 
10 
1360 
20 
1380 
20 
1400 
10 
1410 
9 
1419 
13 
1432 
13 
1445 
15 
1460 
15 
1475 
44 
1519 
6 
1525 
20 
1545 
25 
1570 
15 
1585 
