192 SiMlTHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



ST. CHARLES FORMATION (continued): 



I (continued) : I^eet 



Fauna (105 to 125 feet below the top) : 



Schizamhon typicalis Walcott [1884, p. 70]. 



Eoorthis coloradoensis (Meek) [1870, p. 425]. 



Uoorthis ncwhcrryi Walcott [iQoSrf, p. 105]. 



Syntrophia nundina Walcott [1905, p. 292]. 



Solenopleura. 



Menocephalus. 



Illceniirus. 

 Fauna (20 to 30 feet above base) : 



Lingulella (Lingulepis) acuminata (Conrad) [1839, p. 64]. 



Uoorthis coloradoensis (Meek) [1870, p. 425]. 



Eoorthis nczvbcrryi Walcott [1908c/, p. 105]. 



Agnostus. 



Solenopleura. 



Menocephalus. 



Asaphus ? 



Fragments of fossils occur throughout. 



2a. Massive bedded, dark lead-gray, arenaceous, cliff-forming lime- 

 stone, becoming thinner bedded in the lower 50 feet 195 



2&. Massive bedded, gray, arenaceous limestone with occasional 

 irregular cherty layers which extend down 85 feet, and just 

 below this the dark, arenaceous limestone is almost made up 

 of round concretions 2 to 4 mm. in diameter for a thickness 

 of about IS feet 100 



2C. Gray, siliceous, and arenaceous limestone in layers one-half 

 inch to 6 inches thick, occurring in massive bands. Light 

 gray chert fills large and small annelid borings, and it also 

 occurs as flattened stringers in the line of the bedding and 

 in the layers 85 



Fauna (34 feet from the base) : 



Obolus (JVestonia) iphis, new species. 

 Lingulella desiderata (Walcctt) [1898, p. 399]. 



2d. Massive bedded, arenaceous limestone, forming broken cliffs. 

 A few cherty nodules occur near the top and the lower 50 

 feet has many irregular, oval cherty nodules and stringers of 

 chert coincident with the bedding 397 



Total of 2 yyy 



3. Bedded, bluish gray fossilferous limestone 94 



Fauna (upper part) : 



Acrotreta sp. 



Anomocare. 

 Fauna (near base) : 



Obolus, sp. undt. 



Lingulella manticula (White) [1874, p. 9]. 



BillingseUa coloradoensis (Shumard) [1860, p. 627]. 



Agnostus. 



Ptychoparia. 



