Endothyrid foraminifers and conodonts were used for determination of the age of a core in the Eagle-Picher Industries, Inc. #1 Velie Swalley test hole, which reached a total depth of 76 feet (23.16 m) in SW SW NW sec. 3, T. 35 S., R. 24 E., Cherokee County, Kansas. Mississippian limestone from 75.8 feet (23.1 m) to 50.5 feet (15.4 m) includes beds of Meramecian and possible Chesteran age. Pennsylvanian black fissile shale from 50.5 feet to 37 feet (11.3 m) is Atokan(?) in age. Surface weathering, producing tan to yellowish-brown, iron-stained clay with recent root impressions, penetrates to about 37 feet.
The #1 Swalley lies on the northwestern flank of the Ozark uplift, an irregular domal structure lying in Missouri, northwestern Arkansas, northeastern Oklahoma, and the extreme southeastern tip of Kansas. The difference in elevation of Keokuk (Osagean Stage, Lower Mississippian) beds on the east side of Cherokee County and Salem-St. Louis (Meramecian Stage, Upper Mississippian) and Keokuk beds eight miles to the west in the #1 Swalley is possibly due to faulting and/or folding of these Mississippian beds, which may have been an avenue for implacement of lead and zinc ores in the Tri-State area
