172 KANSAS UNIVERSITY QUARTERLY. 
the Winfield quarry is %° south, 80° west. According to the 
Burden sheet, of the United States Topographic Map, the altitude 
of the Florence limestone at Eaton is approximately 1,375 feet A. 
T., while at Winfield it is 1,117 feet, and the distance between the 
two localities eleven miles, which will give a dip to the west of 
twenty-three feet per mile. In the Winfield section it is ninety 
feet from the base of the Winfield limestone to the top of the mas- 
sive Florence limestone; while in the typical region of the Cotton- 
wood valley it is eighty-four feet. 
On the western bank of the Walnut river, to the west of Winfield, 
is a massive limestone which forms in places a marked escarpment 
along the bluff with a vertical wall of rock ten feet in thickness, 
Along the highway, directly west of Winfield, the ledge is thirteen 
feet thick, the base of which is about forty-five feet above the river 
level.’ The lower part of the ledge, when weathered, is very rough 
with some concretions; near the middle are yellowish shales con- 
taining numerous specimens of AfAyris subtilita and Derbya crassa, 
with a few other species; then comes massive limestone again, 
above which are yellowish shales. It is a clear exposure of the 
Winfield limestone, except that at this: locality the concretions 
which are so prominent at many places as, for example, five miles 
north of the city are inconspicuous. ‘The following species were 
collected in this highway cut: 
Li) ACAV ELS COSEINULA):, SUDTELIER CEUALL INGWD ite Passes itso lanl biinae i Ce) 
One specimen shows the spire very nicely. 
Productus semireticulaius: (Mart, y de Koni: Seu ciiens ua saan An) 
Productus semireticulatus (Martin) de Kon. var. Cadhouni- (rr) 
anus Swallow. 
4. Derbya: crassa (M. and Ho and: Cini ch ieee 2 GG) 
BY eu domonerss 1a Ut. CNiv ten Ciel \etiuthe nal tue Wied aio oh etenas sR) 
6. Aovewlopecten occidentalis (ohtim)) Meekw wii (aire tah (2) 
The difference in altitude between the base of the Winfield lime- 
stone on college hill and on the bluff west of the Walnut river is 
approximately seventy-five feet, while the distance is about two 
and a half miles, which gives a dip to the west across the Walnut 
valley of thirty feet per mile. ! 
ARKANSAS CITY SECTIONS. 
Twelve miles south of Winfield in the valley, between the 
Arkansas and Walnut rivers, is Arkansas City. To the east of the 
Walnut river, at the middle bridge, is a quarry in massive lime- 
1 In vol. il, p. 65, of the Univ. Geol. Surv. of Kansas, the writer gave the dip as forty 
feet per mile across this valley; but that estimate was too great. 
