wniTK.] WASATCH FOSSILS FROM WHITE RIVER VALLEY. 227 



ininjf is more spinous and otherwise more stronja^ly marked than any ol, 

 those otlier forms wiiich liave received sei)arate si)ecilie names. Th(^ ex- 

 amples ot this si)eoies found in the valley of White River are large, 

 some of them beinji: more than two inelies in lenjith, and correspond 

 wilii Hall's figure and description of the variety uodulosum more nearly 

 than the other varieties do. 



5. V'wiparns palKclhuvformis Hall sp. 



This sjiecies Avas described in the same report together with the pre- 

 ceding species un<ler the name of Turbo paludincvformiH. It is a constani 

 associate of Ooniobash fcncra, and at none of the A'cry many localitief* 

 wliere 1 have collected these two species 1 have never found eitiicr of 

 them unaccouii)auied by the other. This species varies compavativeiy 

 little, even in tiie diiferent groups in which it has been found. Only one 

 otlier siiecies of the genus has yet been found in either tlie Wasatch, 

 Green Kiver, or Jiridger Group. This is V. wyomlnf/erms Meelc, wlncli 

 has been found oidy in the Uridger Group. V. x)aliidincefornm i\i)]tnv- 

 ently ranges up into the lower portion of the Bridger Group. 



The fossiliferous horizron that furnished the fossils of the foreg(iin![^ 

 list Avas also found among the upturned strata of Kaven Kidge, west of 

 Haven Pai-k. The ridge has its southeastern end at the western sine of 

 Raven Park and its northwestern end near Section Ridge, a spur of 

 Yam])a plateau. In the upper ])ortion of the Wasatch Group, near ■'he' 

 noith western end of Raven Ridge, I obtained an abundance of spf^ci- 

 mens of Goniohadu tencra and a few of Viriparus pcdudincvformift. Near 

 the southeastern end of the ridge and at the same horizon I obtained a 

 few examples of both those species together with some of Unio 'waslta- 

 kienfiis and U. fdioshonensis. The Green River Group is abundantly 

 shown in this region, in rll the peculiarities which characterize the 

 group at its typical localities, and yet no distinct plane of demarkation 

 or place of separation between it and the Wasatch Group could be nuy- 

 wheie recognized. 



"Wliile passing doA\Ti the valley of White Eiver from Agency Pai'k to 

 Raven Ridge the strata of the Laramie Group came frequently under 

 observation. They were there found to possess all their usual litliologi- 

 cal chanicteristics, and also to contain the great abundance of ])lant 

 renu'.ins that was observed in the Danforth Hills. The only invertebrate 

 fossils, however, that were found in its strata in that region Avere occa- 

 sional examples of Ostrea glahra, which was found to range nearly to the 

 base of the grou]). Directly north of Raven Park and about mitlway ' 

 between White River and Midland Ridge I found numerous examples 

 of Hdhjsitcs major Lesquereux in layers that belong either to the base of 

 the Laramie or to the top of the Fox Hills Group. The horizon is doubt- 

 less i)recisely the same as that at which this fucoid occurs at the mouth 

 of the Saint Vrain's and elsewhere in Eastern Colorado. 



From a point on W^hite River about twenty miles below Raven Park 

 1 crossed to Section Ridge over the broad bad-land district that lies to 

 tlie northward. The dip of the Green River strata which border the 

 lower portion of White River Valley is gently to the northward where 

 1 trjiversed them. About eight or ten miles north of White River I found 

 them to i)ass beneath characteristic strata of the Bridger Group, con- 

 taining fragments of mammalian and chelonian remains. These Bridger 

 strata occupy only a very small area of surface in the immediate valley 

 of Red Blulf Wash, aiid are overlaid by the strata of the Uinta Group, 

 which occui)y the greater ])art of the surface of this bad-land district 

 bordering Green River Valley, They rest unconformably upon strata 



