256 IOWA ACADEMY OF SCIENCE 
Eras 
Periods 
SUB-P. 
Series 
Terranbs 
Thick 
Rocks 
Quarter- 
master 
300 
Sandstones 
C-reer . 
100 
Gypsums 
S Hales 
Late 
Woodward — 
Blninp 
300 
75 
100 
Gypsums 
Shales 
Enid 
Interval _ __ 
Unconformity 
Wellington __ 
200 
Shales 
Marion ^ 
150 - 
Shales - ■ - 
Winfield 
100 
Shales 
Oklahoman.^.... 
Rilp.y .. 
60 
Limestones 
Shales 
Matfield 
75 
Wreford 
50 
Limestones 
ISTposhn 
125 
Shales 
Limestones 
© 
Cottonwood _ 
10 
s ' 
© 
Atchison 
500 
Shales 
H ■ ' 
CARBONIC- 
TTnrbPH 
30 
200 
Limestones 
Shales 
Mm _ 
Platte ■ 
< 
Plattsmouth 
50 
Limestones 
Missourian 
Lawrence ___ 
300 
Shales 
Stanton 
125 * 
Limestones 
Parkville 
100 
Shales 
lola _ 
30 
Limestones 
Thayer 
100 
Shales 
Bethany 
225 
Limestones 
Marais de C._ 
400 
Shales 
Des Moines^.. 
Henrietta 
100 
Limestones 
Cherokee 
300 
Shales 
Arkansan . 
Interval 
Unconformity 
Tennessean 
Unrepresented 
Early— 
Blississippian.. 
Keokuk 
75 
Limestones 
Burlington __ 
100 
Limestones 
EXPLANATORY NOTE. 
The carbonic section of Kansas soon comes in for detailed discussion in an- 
other connection. There are several cogent reasons, for not adopting here the 
subdivisions suggested by the Kansas geologists. As the divisional lines fol- 
lowed well show they are not materially different from Broadhead’s arbitrarily 
chosen and “convenient” groups of half a century ago. 
That Kansas geologists should not agree among themselves upon what forma- 
tions their several subdivisions should include, that those in neighboring states 
should not agree among themselves or with the Kansas workers, and that none of 
these should agree with the Federal representatives and others who have vis- 
ited the region is not passing strange because none of the expressed opinions 
take into account genetic bases. Until the laws of priority in names, the canons 
of nomenclature, the basic principles of stratigraphy, and the essential in- 
fluences of regional diastrophic movements are recognized confusion and dis- 
agreement must continue to prevail in the simplest matters. 
