563 



PAGE 



Unconformity, at base of Flathead quartzite 276 



between Cambrian and pre-Cambrian 282 



Bow River Valley, Walcott discussion of 284 



extent of, between Belt and Cambrian 288 



marked Cambrian, in western America 83 



undosa, see Collenia. 



unispinus, see Asaphiscus. 



United States Geological Survey Bulletin ^.2y, received in Munich (foot- 

 note) 277 



Unkar series (f;'"), pis. 41-43 284-289 



utizia, see Crepicephalus. 



upis, see Crepicephalus. 



Upper Cambrian, localities 4r, 358d 216 



I4d, 67a, 151b, 358c 213 



14V, Utah 207, 389 



15, 107c, 358e 178 



I5j, I5t 185 



16, 91, 119, 150b 218 



i6a, 79d, 79e, 89, 139a 214 



3oh, 301, 30J 207 



30 ', 30y, Orr formation, Utah 374 



30n, Weeks formation, Utah 166, 172, 180, 194, 207, 386, 389 



30 o, Weeks formation, Utah. .166, 172, 180, 194. 195, 207, 389, 391 



30W 227 



76, 76a, 128 197 



77, 109, iioa, III, 136a 194 



78, 78b, St. Lawrence formation, Wisconsin 412 



78, 85, St. Lawrence formation, Wisconsin 406 



78a 163, 167, 192, 198, 209 



79 167- 199, 217 



79c, looa, 107k 165 



79e 217 



79X 167, 193. 209 



80, 82, 82a, 83a, 98X, looa, 134 192 



833, 86c, 97, 99a, i5ie. 339g I99 



83* 163, 209 



83a 163, 192, 209 



84 163. 165. 167, 192, 193, 209, 218 



84a, 98X 167 



90a 170, 171, 213 



91 170. 171, 213, 215 



92X, 92XX, 96c, io6a, 124, 145 170 



98 163, 192, 209 



98a 198 



98X, lOoa 209 



99, 123a, 139a 190 



100 163, 167, 209 



102a, Alaryville limestone, Tennessee 399 



