452 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Eyes of trilobites, general discussion of 239-242 



Facial sutures in the Mesonacidae discussed 242 



Fairview formation, conglomerate at base of 424, 425-426 



correlation of 171 



defined 5 



near Lake Louise, section of 216, pi. 22 



photo of near Fort Mountain pl- 46, fig. 2 



near Ptarmigan Lake pl- 46, fig. i 



unconformity with Hector formation 426-427 



False area, defined 156 



favosa, see Obolella (Glyptias). 

 feistmanteli, see Obolus. 

 ferruginea, see Lingulella. 

 festinata, see Nisusia. 

 Heldensis, see Protypus. 



Finkelnburgia, classification of 142, 148 



evolution of pl. 11 (pp. 140-141) 



Unlandensis, see Obolus (Westonia). 



Fish Spring Range, Utah, fossils in 94 



Assicosta, see Orthis. 



Fitch, Asa, bibliographic reference 373 



HageUiim, see Hyolithcllus. 



Flat River, Missouri, fossils at 71 



Flathead sandstone, mentioned 21 



relation to the Brigham formation of Utah and to the sandy beds on 



Gordon Mountain 8-9 



Flathead sandstone. Little Belt Mountains, compared with sandstone on 



Dearborn River 202 



Flexure line, defined 156 



Fogelsang, fossils from 264 



Ford, S. W., bibliographic references 373 



Ford collection, present location of 268 



Fordilla troyensis, mentioned 341 



Foramen, defined 156 



Foraminal tube, defined 156 



Fordinia, see Obolus (Fordinia). 



Fort Cassin, Vermont, thin section of fossil from 164 



Fort Mountain, Lower Cambrian conglomerate on 424, 425-426 



photograph of pl. 45, fig. 2 



section of pre-Cambrian rocks on 428-429 



unconformity between Cambrian and pre-Cambrian on 426 



Fortieth Parallel Survey, definition of Ute limestone 7 



Freeh, Fritz, bibliographic references ;^y^ 



fremonti, see Olencllus. 



Fruitville, fossils from 304, 310, 340 



Fucoid sandstone, fossils from 263 



Future work 234 



Gallatin Valley, Montana, thin section of fossil from 151, 165 



