APPENDIX. Seats 9 
A. 
GEOLOGICAL FORMATIONS. 
Nature of the geological formations occupying the portion of Oregon 
California included in a geographical survey under the 
direction of Captain Frémont: by James Hall, paleontologist to the 
State of New York. 
varies in latitude through seve# degrees, viz: 38° to 45° north; and speci- 
mens are presented in nearly every alf degree of latitude. Such a collee- 
ons. : foe eR ges 
Longitude 964°, latitude 382°; Otter creek.—The single specimen from. 
this locality isa yellowish, impure limestone, apparently containing organic _ 
structure is obliterated by crystallization. From us posi~ 
