REPORT ON THE FOSSILS ' 143 



Most of the material identified as Cambrian was collected at " Canyon 

 Creek camp." * The species represented are as follows : 



1. DiJcellocephalus f sp. This is the most abundant species in the fanna and is 

 placed in this genus with much hesitation. The glabella is usually all that is pre- 

 served. This portion of the head is rather strongly convex, subquadrangular in 

 outline, with the lateral margins nearly parallel or slightly diverging anteriorly. 

 The occipital furrow is strongly defined, with one much fainter glabella furrow sit- 

 uated at about one-third the distance from the occipital furrow to the anterior ex- 

 tremity of the head. The fixed cheeks are rather broad and moderately convex. 

 In the largest and best preserved specimen the glabella is 19 millimeters long and 

 15 millimeters wide. The smallest specimen is 6 millimeters long and A\ milli- 

 meters wide. 



2. Free cheek of a trilobite, possibly belonging to the species referred to DikeL 

 locephalus. 



3. PtycJioparia sp. A single imperfect head shield. 



4. Undetermined coiled gasteropod shell with an elaborate spire. 



5. Oboella ? sp. Two fragments. 



A few specimens bearing the label " Fossils from conglomerate in 

 sandstone east of granite dike"f also prove to be Cambrian, the 

 species recognized being as follows : 



1. PtycJioparia, sp. undetermined. A single well preserved cephalon. 



2. Fragments of several trilobites too imperfectly preserved for identification. 



All of these fossils would seem to indicate an Upper Cambrian horizon. 



The fossils of the second horizon, the Calciferous of the Lower Ordo- 

 vician, are for the most part from the limestone hills east of Rainy 

 mountain. They were collected from several localities, but as they all 

 seem to belong to a single general horizon, they will be listed all together. J 



1. Pygidium of trilobite. Buthyurus? sp. 



2. Pygidium of undetermined trilobite. 



3. Cyrtoceras, 1 or 2 species. 



4. Hormotoma sp. 



5. Lophospira cassina, Whitf. ? 



6. One or two species of coiled gasteropods like Holopea. 



7. Eaphistoma ? trochiscus, Meek ? 



8. Ophileta complanata var. ? 



9. Bucania sp. 



10. Two or three additional species of coiled gasteropods represented by frag- 



ments. 



11. Orthis or Strophomena sp. Several undeterminate fragments belonging to 



one or the other of these genera. 



* Located in Blue Creek canyon,"about 7 miles due north of mount Scott, 

 f Number 2 Blue Creek section. 



JVaughan (Araer. Geologist, July, 1899, p. 49) collected Rhaphistoma and Ophileta complanata 

 var. nana, as determined by Girty from this general locality.— H. F. B. 



• XX— Bull. Geol. Soc. Am., Vol. 11, 1899 



