SUMMARY 497 



NUMMARY 



In a two months* trip from the MogoUons (south of Flagstaff), in 

 Arizona, to Hurricane, Utah, fossil collections were made from sections 

 in the Kaibab limestone and Moenkopi shales. The paper discusses eight 

 such sections in the Kaibab formation and six in the Moenkopi. The 

 conclusion is reached that the Kaibab, with its 20 brachiopods, 7 pele- 

 c3'pods, and 2 gastropods, is of Permian age, while the Moenkopi, with 

 its 6 brachiopods, 21 pelecypods, and 11 gastropods, belongs, probably, 

 to the Triassic period. A total of 69 species are listed, 34 from the 

 Kaibal:) and 43 from the Moenkopi, a few species being present in both 

 formations. Thus in this region, and extending northward into soutli- 

 eastern Idaho, we have (as summarized on pages 485-486) a persistence 

 of some Paleozoic species, continuing with very little change, apparently, 

 into Mesozoic time. 



