356 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



able, being greenish and shaly and yet not a shale, calcareous but 

 not a limestone, magnesian but not a dolomite, finely siliceous but not 

 a sandstone. This character continues through a thickness of forty 

 to fifty feet of strata." ' . . . . 



St. Lawrence fauna. — The fauna of the upper beds at Osceola, 

 Wisconsin (Locality 78), includes a large group of species as follows : 



LingulcUa mosia (Hall) 

 Lingulella mosia osceola (Walcott) 

 Lingulella winona (Hall) 

 Lingulella winona convexa (Walcott) 

 Billingsclla coloradoensis (Shumard) 

 Finkelnburgia finkelnburgi (Walcott) 

 Finkelnburgia osceola (Walcott) 

 Finkelnburgia osceola corrugata 



(Walcott) 

 Syntrophia barabuensis (A. Winchell) 

 Hyolithes ? corrugatus Walcott 

 Spirodentaliuni osceola Walcott 

 Holopea sweeti Whitfield 

 Metoptoma sp. 

 Platyceras ? 



Owenella antiquata (Whitfield) 

 Murchisonia sp. undt. 

 Agnostus disparilis Hall 

 Ptychaspis sp. (also at Devils Lake, 



81) 

 Ptychaspis ? sp. 

 Dikelocephalus ? limbatus Hall 

 Dikelocephalus minnesotensis Owen ? 

 Saukia leucosia Walcott 

 Sattkia pyrene Walcott 

 Osceolia osceola (Hall) 

 Ptychoparia ? bindosa (Hall) 

 Ptychoparia sp. 

 lllcenurus quadratus Hall 

 Triarthrella auroralis Hall 



At an horizon 50 feet (15 m.) above the St. Croix River Saukia 

 crassimarginatus (Whitfield) (78b) occurs in association with sev- 

 eral of the species in above list. Calvinella spiniger Hall is abundant 

 at about this horizon in the calcareo-arenaceous beds of locality 83' at 

 Trempealeau, and it also occurs lower down in this section at 83'. 



In the lower arenaceo-calcareous beds Dikelocephalus minneso- 

 tensis has its greatest development. This sub-fauna includes : 



Obolus {Westonia) aurora (Hall) 

 Obolus {Westonia) stoneanus (Whit- 

 field) 

 Lingulella mosia (Hall) 

 Lingulella oweni (Walcott) 

 Lingulella winona (Hall) 

 Lingulella winona convexa (Walcott) 

 Finkelnburgia osceola (Walcott) 

 Syntrophia primordialis (Whitfield) 

 Serpulites murchisoni Hall 

 Owenella antiquata (Whitfield) 

 Owenella vaticina (Hall) 



Dikelocephalus minnesotensis Owen 

 Saukia crassimarginata (Whitfield) 

 Saukia lodensis (Whitfield) 

 Saukia pepinensis (Owen) 

 Calvinella spiniger (Hall) 

 Ptychoparia binodosa (Hall) 

 Triarthrella auroralis Hall 

 Ptychaspis n. sp. 

 lllcenurus quadratus Hall 

 lllcenurus n. sp. 

 Aglaspis eatoni Whitfield 

 Aglaspis barrandei Hall 



Dendrograptus hallanus Prout is not represented in our collection. 

 Known from Osceola, Wisconsin, and Lake City, ^Minnesota. 



' Geol. Minnesota, Vol. i, 1884, p. 255. 



