FOSSILS OF THE KNOXVILLE BEDS. 449 



upper part of the beds, with Aucella crasslcnlUs in the same neighborhood, 

 have yielded the same forms of Aucella with Ammonites {Olcostephanus), 

 sp. b, related to Olcostephanus discofalcatus, Lahusen ; Ammonites (^HopUtes). 

 sp. a, related to Hoplites ambligonius, Neumayr and Uhlig ; Belemnites 

 impjressns, Gabl) ; Leda, Astarte, Pentacrinas, etcetera. 



The most northerly locality in the Sacramento valle}" at which Aucella 

 has been found is near Stephenson's, on the Cold fork of Cottonwood 

 creek. The horizon is jirobably very near that of the j^laces just men- 

 tioned, and Aucella crasdcoUis is here associated with Belemnites impressus 

 and species of Pentacrinus, RJiynchonella, Odrea, Lbna, Nemodon, Leda, 

 Trigonia, Opis, Astarte, Corbula, Helcloa, Pleurotomaria and others, none of 

 which can be positively identified with described species, though forms 

 closely related to several of them occur in the Horsetown beds. 



Lower in the Knoxville beds Aucell?e occur at many horizons almost 

 everywhere, but other fossils have been found associated with them at 

 only a few places. On McCarty creek, a short distance north of Paskenta, 

 about 1,000 feet below the top of the Aucell'a beds specimens of Ammonites 

 {Desmoceras) , sp., related to fJesmnceras breweri and Ammonites (^Hoplites), 

 sp. b, were found associated with Aucella crassicolUs. 



In the same neighborhood, probably more than 2,000 feet lower, there 

 is a small limestone that has yielded a numl)er of species, including the 

 following. 



Aucella piochii, Giihh; abundant. Tm-ixi. 



Aucella piorhii, Gahh, vnr. orata : rare. Ohemultzla {'?) 



Xiirnla. Ammointex sp. 



< 'Liprina. Bchnn n Iffs. 

 liJiynchonella. 



On the South fork of Polder creek, near Cooper's, at nearly the same 

 horizon as the last locality, several species have been collected, as follows : 



Aucella piochii , Gabb; very abundant. 



Aucella pi ocJiii, Gabb, var. orata ; rather rare. 



AninwiiiteH {Hoplites) sp. c; related t(j Hoplites sp. a. 



Ammonites {Lytocertix) batesi, Trask (?) Mere fragments with the form of this species. 



Ammonites SY>. Same as the ammonites from last-mentioned locality, havin^: tlie 



form of Ammonites (PJii/llorrrasf) ra)nos}is, Meek. 

 Belemnites sp.; fragnients. 



A few hundred feet higlier in the same section, where Aucella piocJili. 

 var. ovata, is the predominant form, several imperfect specimens of an 

 Ammonites (Perisphinctes) were collected, and at a still higher horizon, 

 where Aucella piochii, var. ovata, is very abundant, a few small specimens 

 of Aucella crassicolli.^ occur witli a slender undescribed species of Belem- 

 nites. in addition to those mentioned, two other species of Hoplites are 

 known from tlie Knoxville beds. 



