PROSSER. | Oretaceous.—The Dakota Sandstone. 185 
One mile south of the above locality and 4 miles west of Smolan 
on the N. W. Cor., Sec. 22, Washington township is the best expo- 
sure of Mentor seen. The rock which varies from brownish-red to 
almost a black color and contains large numbers of fossils is shown 
along the highway just south of the four corners though it can 
scarcely be said to form a ledge. Below are yellowish shales ap- 
parently in the Wellington. From specimens collected at this local- 
ity, Mr. T. W. Stanton has identified the following species: 
1. Ostrea quadriplicata Shum. 
Gervillea Mudgeana White. 
Trigonia Emory? Con. 
Cardium Kansasense Meek. 
Protocardia salinaensis Meek. 
Arcopagella mactroides Meek. 
7. Tapes belviderensis Cragin (?) 
8. Turritella (Mesalia?) Kansasensis Meek. 
The brownish-red sandstone with the lithologic characters of the 
Dakota was first seen on the road, over 3 miles west of Smolan and 
not much farther west loose pieces of the fossiliferous Mentor sand- 
stone were found. 
Five miles west and 4+ mile north of Smolan is another interest- 
ing exposure of the Mentor. ‘The fossiliferous nature of the sand- 
stone is quite well shown in a small draw on the western side of the 
road in the S. E. Quar., Sec. 17, Washington township. Fossils are 
abundant here and below exposed in the side of the draw is a light 
gray to buff soft sandstone, 3 feet thick. To the northwest is a low 
hill, the sides mostly covered, capped by a stratum of fairly thick 
brownish-red sandstone. The rocks forming the greater part of the 
hill above the Mentor sandstone are quite well shown, however, 
in an arroyo on its northwestern side where they are found to be 
mainly yellowish shales. In this draw, at about the same altitude 
as on the eastern side of the hill, loose blocks of the fossiliferous 
Mentor sandstone were found in abundance. An approximate sec- 
tion of the hill appears on the following page. 
B= 9 
SON 
