184 
IOWA ACADEMY OF SCIENCES 
possibly those at the two northern localities may correspond to a sand- 
stone down 90 feet in the boring. The fold is quite sharp at Jones’ point 
and may become a fault on the Iowa side. At any rate there is no con- 
siderable dip in strata not more than half a mile apart. 
The general fact of a southern dip was recognized by Owen, Meek and 
Hayden, Marcou, and other early explorers, but there seems not to have 
been a clear location of it, nor of its amount till the writer presented a 
paper which was published in the Proceedings of the Iowa Academy of 
Sciences, Vol. 1, part 1, p. 58. As that seems to have been overlooked, 
he adds mote from it: 
“Paleontological evidence seems to coincide with the conclusions from 
stratigraphy. Of the more than 100 species listed by Meek as found in 
Eastern Nebraska 20 are found north of the steep fold at Jones’ point 
and not south; 47 are found south but not north, and 35 are found on 
both sides of the line.” 
Combining the section west of Nebraska City, at that point, including 
the boring (Fin. Rep. pp. 103, 101 and 105), section at Wilson’s (White’s 
Report on Iowa, Vol. 1, p. 358) the section at Rock Bluff and below Platts- 
mouth (Playden’s Report, pp. 95 and 93), we have the following: 
Section of Carboniferous Rocks in Southwestern Iowa. Thickness. Total. 
16. Blue, red and ash colored clays, with two layers of limestone 
2 and 4 feet thick 19 19 
15. Yellow micaceous Sandstone 10 29 
14. Drab, ash, lead and chocolate colored clays or shales with a 
thin blue limestone 39 68 
18. Limestone in thin layers, light yellow and gray 12 80 
12. Shales, mostly gray, some red and blue with 5 thin layers of 
limestone and 4 of sandstone 185 265 
11. Bluish limestone, interstratifled with black shales and 1 foot 
of coal near center 12 277 
10. Drab clays, enclosing 8 strata of limestone, 2 — 4 feet thick. 80 807 
9. Compact limestone, mostly thin-bedded and some layers stylo- 
litic 20 827 
8. Drab clays, carbonaceous at two levels, and with 2 thin lime- 
stones 12 889 
7. Soft, fine-grained yellow sandstone, White’s No. 1 at Wilson’s 12 851 
6. Clays and slates, bluish and gray, wfith 8 or 4 limestones, 
one much the thickest sometimes 7 feet 45 896 
5. Limetones, yellow and gray, many Fusilina, 20 416 
4. Clays, ash and red with black shale in middle 5 • 421 
8. Yellowish soft sandstone 4 425 
2. Limestone, very fossiliferous 10 485 
1. Greenish and chocolate clays above and shales below 25 460 
Level of the Missouri at Plattsmouth. 
A careful comparison of sections on both sides of the River shows two anti- 
clinals, the higher with its crest near Plattsmouth, the other about 1 1-4 miles 
above Jones’ Point. Taking the top 
of 
the 
sandstone 
No. 
7 of 
the 
above general 
section, we may represent the folds 
by 
the following : 
TABLE 
ifci 
+j 
.a 
U 
cJ 
-(-> 
o 
a 
s 
cj 
.a 
4-3 
o 
Pl< 
fl 
d 
m 
.C3 
d 
s 
> 
c; 
d 
S 
es 
4-> 
C3 
o 
o 
w 
o 
a 
a 
|3 
'ai 
0) 
d 
o 
a 
o 
>. 
d 
i-A 
a> 
o 
M 
S 
Cm 
cs 
Altitudes above Missouri R. 
16 
12 
23 
128 
91 
38 
78 
62 
212 
287 
Miles from Omaha 
0 
5 
8 
14 
19 
22 
26 
27 
80 
85 
The above data was given in the paper 
in 
1889 
already 
referred 
to, 
but are here revised in statement. 
