﻿48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. y3> 



At the present time fossil tracks are known in these formations 

 only on the Hermit and Yaki trails, but doubtless their geographical 

 range will be rapidly extended now that the precise levels of their 

 occurrence has been determined. 



Previous mention has been made of the curious fact that in the 

 Coconino nearly all of the tracks and trails were going in one direc- 

 tion, that is, up the slopes of the crossbedded sandstones. Examina- 

 tion of many additional hundred square feet of track-covered sur- 

 face all goes to confirm this original observation, for in the hundreds 

 of trails seen in the field only three exceptions to this trend of direc- 

 tion were observed. While slabs of considerable size were collected, 

 larger and more impressive trackways might have been secured but 

 for the difficulty of transporting them to the top of the Canyon, as 

 all of these specimens were brought out of the Canyon on mule back 

 along a narrow and often precipitous trail. It will thus be seen that 

 the size of the specimens collected was always determined by the 

 carrying capacity of a mule, which is about 150 pounds on these 

 trails. 



Preliminary study of this collection of tracks indicates that the 

 known Ichnite fauna of the Coconino will be doubled in the number 

 of genera and species ; that an adequate fauna will be established 

 for the Hermit shale ; and a beginning will be made in the development 

 of a fauna for the Supai formation. The development of these 

 Ichnite faunas may, in the absence of other fossil criteria, be of 

 great assistance in the correlation of other track-bearing formations 

 of distant localities. 



AN ELEPHANT HUNT IN FLORIDA 



A mountable skeleton of some species of American mammoth has 

 been long desired for the National Museum exhibition collection. 

 But while remains of these extinct elephants have been gathered 

 from almost all parts of North America, they consist for the most 

 part of isolated teeth and bones. Occasionally jaws and still les.s 

 frequently skulls with parts of the skeleton have been located. The 

 National Museum has two of these skulls. The smaller, representing 

 the species Elcphas primigenius, is from northeast Siberia ; the larger 

 one, Elcphas horciis, was found in a Pleistocene deposit near 

 Cincinnati, Ohio. The next in importance of remains of the mam- 

 moth in the National Museum is a specimen from Idaho, repre- 

 senting a third species, Elcphas colmnbi. This specimen consists 

 of part of a lower jaw and an upper tooth associated with several 



