NO. 12 SPENCE SHALE AND ITS FAUNA RESSER 3 



Locality ^g. — ^Middle Cambrian, Spence shale; Two Mile Canyon, 

 2 miles southeast of Malad, Wasatch Mountains, Idaho. 



Locality ^2x. — Middle Cambrian, Ute, Spence, Bloomington ; 

 Wasatch Canyon, 5 miles north of Brigham, Wasatch Mountains, 

 Utah. 



It will be observed that part of the collections from all but lo- 

 calities 55c and 54L consists of other than Spence shale fossils. 

 Consequently, assignment of species to the Spence shale is certain 

 only for locality 55c where all fossils came from a thin bed with 

 no chance for admixture, and locality 5g on the western side of the 

 Wasatch Mountains. Species believed to represent the Spence fauna 

 have been chosen from the collections of localities 55e, 20x, and 32X. 

 This choice is based on lithology and generic assemblages on hand 

 pieces of rock. 



IVestonia ella (Hall and Whitfield) was described originally from 

 locality 556. At several places this species presumably appears in 

 the Spence shale fauna, but evidently is present also in the higher 

 beds of the Ute formation. However, since the species was not found 

 at Spence Gulch, it has been omitted from the illustrations. 



Zacanthoidcs is present also in localities 55e and 20x, but the species 

 are not identifiable owing to the fragmentary nature of the material. 



The Archaeocyathinae are possibly represented (pi. i, fig. 39). 



DE.SCRIPTION OF SPECIES 



ALGAE 



MORANIA Walcott, 1919 



MORANIA, sp. undet. 



Plate I, fig. 40 



A few Spence shale surfaces show flat algae of the Morania type. 

 Morania is found in highly fossiliferous argillaceous shales almost 

 everywhere in Lower and Middle Cambrian strata. 



Locality 55c. 



Figured specimen. — U.S.N.M. no. 96491. 



ECHINODERMATA 



EOCRINUS Jaekel, 1918 

 EOCRINUS LONGIDACTYLUS (Walcott) 



Plate I, figs. 41, 42 



Eocystites?^ longidactylus Walcott, U. S. Geol. Surv. Bull. 30, p. 94, pi. 5, 



fig. 3; pi. 6, fig. I, 1886. 

 Eocrimus longidactylus Jaekel, Pal. Zeitschr., vol. 3, p. 24, 1918. 



