172 TTTK CLAYS OF ARKANSAS. 
wells and cisterns duo- about Cumberland, Rock, Twentieth, and 
Twenty-first streets. 
The following records were gathered by Mr. Siebenthal: 
A well at Fifteenth and May streets passed through the Tertiary 
shale. 
A well near the northwest corner of Thirteenth and Jones streets 
passed through 10 feet of soil and gravel and 18 feet of shale. 
A well 14 feet deep at Fourteenth and Marshall streets passed 
through dark shale most of the way. 
A well at the southeast corner of Twenty-seventh and Wolfe streets 
passed through 10 feet of gravel and sandy clay and 20 feet of dark 
Tertiary shale. 
A well on Mr. Robert's place, Twenty-second street, between Com- 
merce and Sherman, passed through 19 feet of soft Tertiary shale, 
and two other wells in adjoining lots to the east penetrated 60 feet 
of the same soft shale. 
A well at the corner of Sixth and College streets passed through 
30 to 35 feet of dark Tertiary shale. 
A well bored by the Cotton Belt Railway Company on Rector ave- 
nue between Third and Fourth streets passed through the following: 
Serf ion in well of Cotton Belt Railway Company, Rector avenue, Little Rock. 
Feet. 
Soil 12 ( 
Dark Tertiary shale 20 
Paleozoic shale 29 
Sand (?) C> 
A well on Ninth street opposite the arsenal is reported by the 
digger to have the following section: 
Section on Ninth street near the arsenal, Little Rock. 
Feet. 
Soil and clay 20 
Tertiary shale 8 
White gravel 4 
These facts and others not here given lead to the belief that the 
Tertiary clays follow the brow of the hill where the Arch street pike 
descends the slope about the middle of sec. 15, encircle the narrow 
valley that heads about the corner of Nineteenth and High streets, 
pass around it, and thence extend southward along the slope of the 
hill that runs along the east side of sec. 16, return northwestward 
along the valley through which the Iron Mountain Railway passes, 
appear again in the vicinity of the hospital on the west side»of the 
railway, and thence around the hills west of the hospital. Of course, 
it is understood that these beds are nearly horizontal and that they 
pass right through the hills mentioned and have their edges exposed 
only on the slopes of the ridges. Almost everywhere, however, the 
