FAUNA or THE POGONIP. !')?, 



A similar iiTOupiiiji' i>t' fossils was procuird in the Fish Creek Moun- 

 tanis a short distauce below the quartzite, numerous localities yiehliny 

 nearly identical lists: 



Heecptaculites elliptk-us. Modiolojisis occideiis. 



Receptaeulites elon},'atus. Modiolopsis pojjouipciisis. 



Reccptaculiti's mammillaris. Pleurotoinaria sp? 



Cystideaii plates. Maclnrca sp? 



Ptilodictya sj)? Ortlioceras inulticaineratniii. 



l\[onti(;uUip()ra sp? Kiidoceras proteitbrme. 



(htliis perveta. Auipliioii iievadciisis. 



Ti'lliiiomya coutracta. Cera urns sp? 



On the north slope of Siu-prise Peak, just below the ([iiartzite, the lime- 

 stone suj)pliod the following : 



Kecoptaeulites mainuiillaris. Rapliistoina uasoiii. 



Cystideaii plates. Pleurotoinaria ? 



Oitliis per\-eta. Maelurea aimulata. 



Ortbis tricciiaria. Leperditia hi via. 

 A convenient locality to tlio.se visiting Eureka and wishing to exam- 

 ine the Upper Pogonip beds ma}' be found on the west side of Caribou 

 Hill, which has furnished a few typical forms : 



Ortliis perveta. Recei)taculites luaiiiiiiillaris. 



Ortliis triceiiaria. Maelurea amiulata. 



Asaphus caribouensis. 



Other localities which have presented evidences of the same horizon 

 may be found in Goodwin Canyon, at the head of Lamoureux Canyon, 

 and in the limestones not tar from the line of the general section E F, 

 atlas sheet xiii. 



This grouping of fossils from the summit of the Pogonip limestone is 

 of special interest on account of the commingling of species and the position 

 of the strata. Ascending in the beds it will be found that the Cambrian 

 fauna entu-ely disappears, the life of the Middle Pogonij) gradually 

 ])asses away, and new species come in until the grouping of the fauna 

 presents an aspect peculiarly its own. Two species of the genus Modiolop- 

 sis, and the characteristic fossil, Tellinomya contracfa, foreshadow still higher 

 strata, indicating' the coming in of tlie Trenton horizon. The summit of 

 the Pogonip is also marked liy an increase in tlie number of species of 



