82 Uniwersity of Kansas Geological Survey. 
This division of the Red-Beds seems to have been carried to a 
greater extent than the differences in the lithologic characters of the 
rocks would justify for the rank of a formation. Perhaps it is well 
cnough to consider them as sub-formations, and group the whole 
mass of rocks in three formations, as will be indicated in the closing 
part of this subject. The names used by Professor Cragin for these 
divisions are based upon names of localities occurring, with one ex- 
ception in southern Kansas. The lowest terrane, termed Harper 
sandstones, which Professor Cragin estimates as having a thickness 
of 659 feet, is named from the exposures of brownish red sandstone 
and shale quarried near the city of Harper in Harper county. The 
Salt Plain measures are named from the Salt Plain along the Cimar- 
ron river in the northern part of Oklahoma. The Cedar Hills form 
the bluffs along the eastern side of the Medicine Lodge river in 
southeastern Barber county, which is the typical region for the 
Cedar Hills sandstone. The variegated shales called the Flower:pot 
shales are well exposed on a mound between East and West Cedar 
creeks, eight miles southwest of Medicine Lodge, locally known as 
the Flower Pot mound. The Cave Creek gypsums include the Medi- 
cine Lodge gypsum capping the Gypsum Hills southwest of Medicine 
Lodge, and the higher bed of gypsum in the southeastern part of 
Comanche county along Cave creek, which has suggested the name 
for that terrane. The Dog Creek shales are named from the expo- 
sures along the creek of that name which enters the Medicine Lodge 
river between Mingona and Lake City, Barber county. The Red 
Bluff sandstones are conspicuous along Bluff creek in western 
Comanche and eastern Clark counties, where they have a thickness 
of perhaps 200 feet. The thin dolomite in the upper part of the Red- 
Beds is named Day Creek from its exposures near the head-waters 
of that creek in the eastern part of Clark county; while the Hack- 
berry shales are named from exposures along the creek of this name 
in the northern central part of Clark county. Capping the Red- 
beds is the Big Basin sandstone material named from the Big basin 
in the western part of Clark county, which is referred by the writer 
to the Comanche series. 
Finally, on the “Geologic map of Kansas” by Professor Haworth 
this terrane is termed the Red-Beds without making any further 
