IO OLAF HOLTEDAHL. M.-N. Kl. 
several of the forms cannot be determined with any great exactitude. Two 
of them, Receptaculitis oweni HALL and Gonioceras occidentale HALL are 
typical Trenton fossils, characteristic of the lead region of [llinois, Wis- 
consin, etc., and Actinoceras beloitense WHITFIELD occurs in the Buff Beds 
of Wisconsin, somewhat lower. The forms which are not quite determined 
cannot be assigned any particular significance from a stratigraphical point 
of view. Most of the forms may be considered without any difficulty as 
occurring in a stratum of Trenton age, and only one — Lurystomites sp. — 
must presumably be assigned to a lower horizon. 
