SECTION OX XORTH FORK OF COTTONWOOD CREEK. 



443 



Feet. 



Rocks. 



Fos^sils 



f 500 



1,000 



1,500 

 2,000 

 2,500 



o-i 



Q 



Shales 



Sandstones 

 and shales. 



Shales, with 

 occasional 



thin beds of 

 sandstone. 



Xucula t run cat a. 



J Nucula truncata. 



\ Ammonites {Schloenbachia) chicoeusis. 



Same as above. 



f Inoceramus whitneyi. 



-{ Pecten, sp. a. 



I Potamides te'tuiis (?) 



I Lunatia, sp. 



t Trocho^inilia, sp. 



Amm. {Li/toreruft) mcya (?) 



:],000 



:},500 



Conglomerate 

 and sand- 

 stone. 



Shale. 



Conglomerate 

 and sand- 

 stone. 



Shale. 



Sandstone j 

 and shale. * 



4,000 Shales, con- 



sideralilv dis- r • 



4,500 turbed, with- I / 

 out prominent *- 



5,000 bed of sand- 



5,500 stone. 



6,000 



Pecten opercnliform is. 

 Exogyra pcira-^itica. 

 Nemodon vancourerensls. 

 Cncidlxa truncata. 

 Trigonia evansana. 

 Trigonia leana. 

 Coralliochama orcutti. 



Crioceras percostatus. 

 Ancyloceras llneatua. 

 Turnu.s plenus. 



Amm. {De.smoceras) hoffrnnnni 

 Criocerax percostatus. 



Pecten operculiforniis. 

 Cuculla'a truncata. 

 Trigonia evansana. 

 Meekia sella. 

 Chione rarians. 

 Caryatis nitida. 

 Gyrodes e.vpansa. 

 Anchura californica. 

 Cinulia ohliqua. 

 A m monites {Acanthoceras) , 

 Amm. {Desmoceras) , sp. a. 



Anchura falciformis. 

 Amm. {Desmoceras) hoffmanui (?) 

 Amm. {Desmoceras), sp. a. 

 Amm. {Desmoceras), sp. b. 



f Exogyra parasitica. 



J Cuculliea truncata. 



j Luncdia avellana. 



I Amm. {Schloenbachia) infiata. 



500 ! Sandstone. 



I Shales, with 

 : thin beds of | . 

 " 000 f^aiidstone I 

 ' "^^ j near base. 



7,500 I 



8,000 



Amm. {Lytoceras) batesi. 

 Amm. (Desmoceras) hoff- 

 manui. 

 Amm. {Phylloceras f) ramosuo. 

 Amm. {Hoplites) remondi. 

 Anci/larerax renumdi. 



Sandstone. 



I. J 



1 1 



S,500 



i),000 



Shales. 



Conglomerate, j 



' Pecten operculij'ormix. 



Plindida cariata. 



Xeniodon vancou cerensis. 

 JTrigon ia a'quicosfata. 



Pli'uroniya hvrigata. 



Lunrdia arellana. 



Pot a ni ide.^ diadema . 



A)nino)iltes {Lytoceras) hates 



Dipt yell ore rax hvris. 



Bt'lemn ite.^ inipres.<<us. 



' Pecten operculifonnis. 

 Nemodon vancouverenxis. 

 ' Trigonia leana. 

 I Trigonia xquicostata. 

 t Diptychoceras Ixvis. 



Pecten opercnliform ix. 

 Oxytoma mucronata. 

 Plicfdula va riata . 

 Xemodon rancourerensis. 

 Trigon ia xquicostata. 

 Pleuroniya bvvigaia. 

 Lunatia areUa)U(. 

 Helicaulax t/icarinata. 

 Potani ides diadema. 

 Belemnites impressus. 



Diorite. 



LXII— Buu.. GKor,. Soc Am., Vor,. 5, IS9:J. 



