NO. 2.] STRATIGRAPHIC RESULTS. 115 



Cadoceras sp. indet. - 

 are also proved to be of the age of the Middle Callovian. 



Owing to the fact, that the Belemnites m. f. subextensus Nik. Panderi 

 d'Orb., now before me (also from clay sandstone) is closer related to Belem- 

 nites subextensmNik. than to Belemnites Panderi d'Orb. (which species only 

 becomes more frequent in the Oxfordian, and continues up to the Volga-Stufe), 

 the determination of the clay-sandstone as Middle Callovian also appears 

 justifiable. 



Without the accompanying Ammonites, the Lamellibranchiata in the 

 clay-sandstone would afford no certain clue to the age of the rocks 

 the Lamellibranchiata in the Jura being, as a rule, less qualified for an exact 

 determination of age than are the Ammonites. Pecten Lindstromi Tullberg \ 

 and Macrodon Schourovski F. Rouill. sp. 2 would point towards the Upper 

 Jura-Malm. Pseudomonotis sp. (cf. ornati Quenst. sp.) 8 admits of an alliance 

 with the Middle and Upper Callovian and, through its relationship to Limea 

 duplicata Goldf., ? Limea cf. duplicata permits of determinations from the 

 Bathonian to the Oxfordian. Generally, however, the Lamellibranchiata from 

 the clay-sandstone of locality 5 - - watercourse below the basalt, just above 

 (N. of) Elmwood -- agree very well with the determination of age: Middle 

 Callovian. 



Besides clay-sandstones with the above-mentioned fossils I have before 

 me, from the same locality, and from a height of about 550 ft, a fragment, 

 embedded in gray-brown clay, of a body-chamber of Cadoceras Tchefkini 

 d'Orb. sp., a species characteristic of the Middle Callovian. This piece affords 

 evidence which can also be obtained in other ways -- that the Middle 

 Callovian in the district of Cape Flora is not only in the form of beds of 

 clay-sandstone, but that clayey strata also share in its composition. 



As Cadoceras Nanseni n. sp. is considered to be a species belonging to 

 the Middle Calovian, the 



hard, gray or yellow stone-marl ("Steinmergel") 

 (p. 47) in which the presence of Cadoceras Nanseni n. sp. 4 and (once) Pseudo- 



1 Only known, so far, from the Aucella strata of Novaja Semlja. 



2 From the Virgati strata of the Moscow Jura. 



8 Pseudomonotis ornati was described by Quenstedt from the Ornaten-Clay of Wurt- 



temberg. 

 4 Also a fragment of an indeterminable Pecten. 



