6 CHARLES S. PROSSER 



ing section of the Nemaha county quarry gives a clear idea of 

 the character of the Cottonwood limestone and associated rock^ 

 as they appear in Nebraska. 



SECTION OF THE NEMAHA COUNTY QUARRY. 



Ft. In. Ft. In. 



5. Soil 3 = 12 10 



4. Somewhat shaly light gray limestone used for riprap. 

 Fossils common, especially Athyris {^Seminuld) subtilita 

 (Hall) Newb. - 2 10 = 9 10 



3. Light gray shaly limestone changing to shales on weath- 

 ered surface, used for railroad ballast. From i foot i 

 inch to I foot 9 inches in thickness. Fossils not so 

 common as in upper limestone - - - - -19= 7 



2. Cottonwood limestone, of light gray color, containing 

 immense numbers of Fiisulina cylindrica Fischer. In 

 two layers, the upper 2 feet and the lower i foot thick, 3 =^5 3 



I. Light gray to slightly yellowish limestone, which con- 

 tains some almost white streaks and in places is bluish 

 in color. Very few specimens of Fusiilina. Bottom of 

 the quarry - - - - - - - -23=23 



As stated above, No. 2 of the section contains immense 

 numbers of Fusiilina cylindrica Fischer with an occasional broken 

 spine of Archceocidaris sp.; while in No. i there are very few 

 specimens of Fnsidi?ia. This character agrees with the Cotton- 

 wood limestone at its typical localities in Kansas where the 

 Fusulifias are only found abundantly in the upper part of the 

 limestone. On this account it seems advisable to the writer to 

 regard both Nos. i and 2 as representing the Cottonwood 

 limestone of Kansas which will give it a thickness of five feet 

 three inches in the Nemaha county quarry. The shaly lime- 

 stones and shales above the Cottonwood limestone — Nos. 3 and 

 and 4 of the section — contain a moderate number of fossils 

 although none of the species are abundant. The following were 

 collected : -\ 



Athyris {^Seminiild) subtilita (Hall) Newb.=^. argentea (Shep.) Keyes 

 (c).^ 



Productus semireticulatus (Mart.) de Kon. (c). 



^ The relative abundance of the species is indicated in the following manner : 



