400 C. R. Stauffer — The Minnesota Devonian. 



Section of Lar sen's Quarry in the Southwestern Fart 

 of Spring Valley. 



Pleistocene and Recent. Thickness 



4. Soil and drift 1' 0" 



Devonian (Cedar Valley limestone) 

 3. Limestone, gray to brown or buff, badly weathered, 

 containing 

 Atrypa reticularis (Linnaeus) (c) 

 Productella subalata (Hall) (c) 



5' 0" 



2. Limestone, buff, massive, with abundant fossils of 

 which the following are the more important : 



Atrypa reticularis (Linnaeus) (c) 



Cyrtina hamiltonensis Hall (c) 



Gypidula laeviuscula Hall, (r) 



Productella subalata Hall (aa) 



Nuculites sp. (r) 



Murchisonia cf. dowlingi Whiteaves (r) 



Trochonema sp. (r) 



Trochonema monroei Cleland ? (r) 



Crinoid stems (c) 

 1. Limestone, brown to buff, with fossils common 



Chonetes scitulus Hall (c) 



Cranaena iowaensis (Calvin) (c) 



Cyrtina hamiltonensis Hall (t) 



Productella subalata Hall (a) 



Reticularia fimbriata (conrad) (r) 



Spirifer bimesialis Hall (r) 



Spirifer iowaensis Owen? (a) 



Spirifer sp. (r) 



Stropheodonta demissa (Conrad) (c) 



Paracyclas sp. (r) 



Bellerophon sp. (c) 



Trochonema sp. (r) 



Coleolus sp. (c) 



Proetus sp. (c) 



3' 4" 



Somewhat higher beds occur along the state line high- 

 way. About five miles w r est of Granger the surface is 

 strewn with fragments of the Devonian limestone and in 

 some of the fields there are great heaps of rock that have 

 been gathered from the surface in clearing the land for 



