Lower Cretaceous of Kansas. — Gou/d. 25 
I. Comanche series. 
2. Kiowa shales. 
I. Cheyenne sandstone. 
The Spring Creek clays rest on the Kiowa and consist of 
whitish to yellowish clays with many ironstone concretions. 
The thickness is sometimes forty to fifty feet. They are now 
known to contain fossils. 
The Greenleaf sandstone is fifty to sixty feet thick and 
is composed of gray, brown or yellow, rather hard and some- 
what cross-bedded sandstone with bands and pockets of clay 
ironstone. It contains invertebrates and shark's teeth. 
The Kirby clays rest on the Greenleaf and include a series 
of twenty to thirty feet of variable whitish to yellowish clays 
containing some layers of sandstone. 
The term Reeder sandstone was first used by professor 
Cragin.* As used in my paper the term included the dark 
brown sandstone, usually concretionary, below the true leaf- 
bearing Dakota. Leaves have since been found in the Reeder 
and the term becomes synonymous with Dakota. 
The entire series is characterized by pockets and bands of 
dark brown or black ironstone concretions breaking with a 
conchoidal fracture. The broken fragments cover the slopes 
and often render them conspicuously brown for miles. The 
principal outcrops in the locality are on the head-waters of the 
Medicine river on Greenleaf and Fullington ranches, some 
ten miles west of Belvidere. Dr. T. W. Stanton first found 
Kiowa fossils in the Spring Creek and Greenleaf and as the 
Reeder has proven to be the same as the Dakota it would seem 
unnecessary to retain formation rank for the beds. That they 
are however a series of transition beds will scarcely be denied. 
2. Fossils. 
Dr. Stanton kindly sent me a list of the fossils found on the 
Medicine river above the formation hitherto considered as 
Kiowa. I quote the following lists from his letter of the date 
of February 17, 1899. 
"Fossils from the Spring Creek beds, from the hill south of 
the forks of the Medicine river, seven miles west of Belvidere, 
♦American Geologist, vol. XVI, p. 381, 1895. 
