4 PROCEEDIJSTGS OF THE NATIONAL MUSEUM vol. 91 



Indicative of an earlier age than that of the Dragon level and 

 approaching more closely that of the Puerco is the presence in the 

 Wagonroad fauna of forms representative of the genera Taeniolabis^ 

 Ectoconus^ and Garsioptychus. However, the separation in time of 

 the two levels in the Dragon Canyon area is not great, as a relation- 

 ship between the two stages is seen in the materials of Prolog onodon%^ 

 Haploconus^ and of the new form Desmatoclaenus. The Wagonroad 

 is obviously more nearly comparable to the Puerco stage than it is to 

 that of the Torre j on. 



Reviewing the list of forms now known from the Dragon it would 

 seem that the fauna was closely related to that of the Torre j on or 

 Crazy Mountain Fort Union ; however, a closer study of the individual 

 forms in many cases shows them to be less distinctly removed from 

 related types in the Puerco. This is noticeable in the periptychids, 

 certain of the carnivores, and most markedly in the taeniodonts, the 

 latter group apparently having undergone considerable change in at 

 least two lines during lower Paleocene time. Many of the forms 

 present, such as the multituberculates and insectivores, can be com- 

 pared only with later types as ancestral stages of these are 

 not known in the Puerco. The conclusion is that the Dragon fauna 

 is intermediate between Puerco and Torre j on faunas in stage of 

 development, perhaps a trifle closer to the Torre j on, whereas the 

 Wagonroad fauna is definitely closer, if not equivalent, to that of the 

 Puerco. 



GEOLOGIC RELATIONS 



Work during the summer season of 1939 included an investigation 

 of the geologic relations existing in and around the Dragon in order 

 to show the distribution of certain formations and to account for 

 the otherwise anomalous position of m.nny of the fossil localities. 

 For this purpose a small map has been prepared (fig. 1), using an 

 enlargement of a portion of the topogrrphic and geologic map of 

 E. M. Spieker as a base. The later Cretaceous and Paleocene beds 

 previously undifferentiated are here distinguished and the distribution 

 of these together with that of the Flagstaff limestone and later 

 deposits is more accurately shown. Moreover, a greater refinement 

 of the fault pattern is indicated. 



Stratigraphy. — The older rocks, including the Blackhawk and Price 

 River formation, and a limited exposure of Star Point sandstone in 

 Ferron Canyon are all of Cretaceous age and have not been dis- 

 tinguished on the map. They consist principally of massive buff 

 sandstones with interbedded clay shale, sandy clay, and coal (in the 

 lower part), and with a certain amount of conglomeratic material 

 in the Price River formation. 



