C. R. Stauffer—The Minnesota Devonian. 399 



Athyris fultonensis (Swallow) (r) 



Atrypa histryx Hall (c) 



Atrypa spinosa Hall (r) 



Chonetes scitulus Hall (c) 



Cyrtina haniiltonensis Hall (c) 



Gypidula lawiuscula Hall"? (r) 



Martinia sp. (c) 



Productella subalata Hall (a) 



Schizophoria striatula (Schlotheim) (c) 



Spirifer bimesialis Hall (a) 



Spirifer iowaensis Owen? (c) 



Stropheodonta demissa (Conrad) (r) 



Stropheodonta lialli musculosa Cleland (?) (r) 



Bellerophon perplexa AValcott (c) 



Pleurotomaria sp. (r) 



Troclionema sp. (c) 



Coleolus sp. (r) 



Proetns sp. (c) 



....16' 0" 



4. Limestone, partly covered 10' 8" 



3. Covered interval 11' 4" 



Ordovician (Maquoketa shale) 



2. Limestone, buff to brown, shaly, containing Stro- 



phomena fluctuosa Billings 10' 0" 



1. Shale, buff to brown, massive, extending to the 

 level of Bear creek. It contains the following 

 fauna 

 Dalmanella testudinaria (Dalman) 

 Lingula elder i Whitfield 

 Plectamonites sericeus (Sowerby) 



10' 8" 



These same Devonian beds ontcrop abundantly around 

 Spring Valley. Etna, and southward into Iowa. In 

 Spring Valley the old city quarry, at the corner of Church 

 Street and Broadway, exposes about eighteen feet of 

 slightly higher limestone, but Larsen's quarry in the 

 southwestern part of town is essentially the same horizon 

 and affords better collecting. 



