Correspondence. 359 
cessor, the North Cauadiau, is more Hunted, and ou the Cimarron river 
still more so, in ac;cordanee with the general northward contraction of 
the Permian area of the Plains. On the north side of the Beaver the 
most westerly outcrops of the Kiger were seen in a bluff cut by this 
stream at Mr. John George's place, about six miles west of Beaver 
City, and in a less conspicuous exposure some three miles east of the 
mouth of Sharp's creek. On the south side, beginning with the red 
shales and plum-pudding gypsum that I have previously reported on 
Clear creek,* outcrops of red and more or less mottled shales and sand- 
stones of this division were found on Home, Six-mile, Dugout, Willow, 
and Jackson creeks, and were reported to occur as far west as Fulton 
creek, four miles west of Fulton post-office. On Jacks(jn creek the beds 
of the Kiger present strong dips, a feature common in the Red Bluff 
formation of Clark county, Kansas, and one upon the possible causes 
of which I have elsewhere commented. In one left-side exposure a 
mile or two above the mouth of the creek, I measured a southerly dip 
of 28 degrees, in another, about a quarter of a mile farther up the creek, 
this southerly dip finds its complement in a northerly one somewhat 
less steep. The summit of the syncline thus indicated is concealed by 
Neocene deposits. Anticline-like undulations are seen in a larger right- 
hand bank of the' red rocks still farther up the creek, just below the 
Rothwell-Boyd mail road. The Kiger rocks there are also more or less 
fractured, and the fissures are partly filled with seams and nests of 
limpid calcite. 
I first observed these Beaver county red-beds and their included gyp- 
sum on Clear creek, a short distance southeast of Beaver City, in 1890. 
I briefly noticed them in 1891 in my paper, "On a Leaf-bearing Terrane 
in the Loup Fork," (American Geologist, vol. viii, p. 29,) where, in 
accordance with the view then prevailing, I referred them to the Trias- 
sic, and again in "The Permian System in Kansas," where I recognized 
their Permian age and placed them in the Cimarron series, but was un- 
certain whether the gypsum should be referred to one of those of the 
Cave Creek formation or to a higher horizon. The gypsum horizon 
seen on Clear creek is now known to be well up in the Kiger division 
and, from its occurrence near Beaver City and in the county and river- 
basin of Beaver, I propose to call it the Beaver gypsum. A thin band 
of gypsum which I recently observed on Home creek and a six-foot bed 
which I failed to see, but which, according to Mr. J. J. Fulkerson, out- 
crops on the south side of the Beaver opposite Sharp's creek, and a 
ledge on the west prong of Jackson creek, which Mr. Fulkerson states 
to be the most westerly gypsum that he has seen in the Beaver valley, 
may all belong to the horizon of the Beaver gypsum, though I cannot 
*Iii "'Tlie Permian System in Kansas," I roforrod to a peculiar feature well sbowu 
ill part of the yyusuni on (;ioar creek as rcscmblin^r "plums in a i)Ucldinfj-" I find 
that in the Second Annual Keport of the Texas State (ieoloH-ical Survey, Mr. \V. F. 
(Jummins Imd earlier mentioned a "plum-piul(lin«" gyijsum in the l*erniiau of Texas, 
"containing small round crystals" and apparently liku tiiat on Clear creek except in 
not haviLiijr tlie "plums" salmon-colored. Only a jiart of tlie led^e on Clear creek 
T^hovvs the plum-puddiuA? structure well, and tlie plums in tiiat are not all salmon- 
<'oU)red;but when th(» structure and color both appear, and especially where a 
weathered surface can be found, the rock makes beautiful cabinet specimen-j. 
