UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 5, No. 8, pp. 145-148 ANDREW C. LAWSON, Editor 



FISH REMAINS FROM THE MARINE LOWER 

 TRIASSIC OF ASPEN RIDGE, IDAHO 



BY 



Malcolm Goddard. 



The fragmentary fish remains described in the following- 

 paper were obtained on a paleontological expedition visiting 

 southern Idaho during the summer of 1903 for the purpose of 

 studying the Lower Triassic outcrops at Aspen Eidge, about ten 

 miles east of Soda Springs. 



The material is all very fragmentary, consisting of disarticu- 

 lated bones, occurring in thin slabs of shaly limestone. The rock 

 abounds in ammonites and in some cases is practically composed 

 of them. The forms present, of which the characteristic one is 

 Meekoceras, point to the horizon as Lower Triassic. Professor 

 James Perrin Smith of the Leland Stanford Junior University, 

 who has made a special investigation of the invertebrate fauna 

 of this horizon, places it in the Lower Triassic, below the beds of 

 Paris Canon from which H. M. Evans has recently described a 

 new cestraciont spine. 1 The deposit in which the bones occur is 

 of marine origin, as shown by the abundance of cephalopods and 

 other marine molluscs, and in this respect differs from the de- 

 posit in which the type specimen of Megalicltthtjs was found, 

 which is a fresh-water limestone. The remains seem, however, 

 closely allied to those of fresh-water formations. 



The material collected at Aspen Eidge contains 81 specimens, 

 comprising fragments of jaws, teeth, scales, supposed opercular 

 bones and a number of bones which are indeterminable. Most 



1 Bull. Geol. Dept. Univ. of Cal., Vol. 3, No. 18, p. 397, pi. 47. 



