206 P. E. Raymond — Ceratopyge Fauna 



to have been derived from strata in the npper 640 feet, 

 contained the following species (names corrected to agree 

 with later publications by Walcott) : 



Eoorthis desmopleura (Meek), Schizambon typicalis Walcott, 

 Agraulos sp. ind., Solenopleura ? sp. hid., Tsinania cleora 

 Walcott. 



The last species is really a Symphysurus. "Walcott 6 

 proposed the genus Tsinania for trilobites of the type of 

 Illaenurus canens Walcott, a Chinese species which has a 

 cranidium similar to that of Symphysurus, but more 

 nearly hemispherical, and a pygidium which is nearly as 

 long as wide, This latter feature is the most distinguish- 

 ing one for the genus, and is not shared by any American 

 form. Tsinania cleora, as shown by Walcott 's figures, 

 has the short pygidium of the typical Symphysurus. 



The Blacksmith Fork section in the Wasatch Mountains 

 of northern Utah was also described by Walcott. 7 Both 

 the Lower Ordovician, and the upper 190 feet of the 

 St. Charles formation, referred to the Upper Cambrian, 

 contain the Ceratopyge fauna, although some of the more 

 characteristic trilobites are lacking. Important species 

 in the St. Charles are: Eoorthis desmopleura (Meek), 

 Syntrophia nundina Walcott, Schizambon typicalis Wal- 

 cott, Menocephalus sp. ind., and Illaenurus [Symphy- 

 surus] sp. ind. 



According to Tomlinson, 8 Beekmantown fossils are 

 present in strata 1,260 feet above the top of the St. Charles 

 formation. 



Richardson 9 has described briefly a section in the Ran- 

 dolph quadrangle in Northern Utah. This is east of the 

 section on Blacksmith Fork, and the Cambrian sequence 

 is the same. 



Resting on the St. Charles is the Garden City limestone, 

 with a thickness of 1,000 feet/which contains a fairly large 

 fauna, partially identified by Kirk. Although the aspect 

 is in general that of the Beekmantown, one can find sug- 

 gestions of the Ceratopyge fauna. 



Above the Garden City is the Swan Peak quartzite, 500 

 feet thick, from which some fossils have been obtained. 

 Among them Kirk has identified Symphysurus goldfussi 



Smithson, Miscl. Colls., vol. 64, No. 1, p. 43, 1914. 



7 Smithson. Miscl. Colls., vol. 53, p. 191, 1908. 



b Jour. Geo!., vol. 25, 1917. 



9 This Journal, vol. 36, p. 406, 1913. 



