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 subextensus 'Nik. 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. Peden Lindstromi Tullberg^ 

 and Macrodon SchourovsM F. Rouill. sp.^ would point towards the Upper 

 Jura-Malm. Pseudomonotis sp. (cf. ornati Quenst. sp.)^ 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 locahty, and from a height of about 5.50 ft, a fragment, 

 embedded in gray-brown day, 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.* and (once) Pseudo- 



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



^ From the Virgati strata of the Moscow Jura. 



' Pseudomonotis ornati was described by Quenstedt from the Ornaten-Clay of Wiirt- 



temberg. 

 ■• Also a fragment of an indeterminable Pecten. 



