122 POMPECKJ. JURASSIC FAUNA OF CAPE FLORA. [NOEW. POL. EXP. 



The clay containing Quenstedtoceras vertumnum must certainly have 

 come originally from higher strata. Granted that the strata above Elmwood 

 are undisturbed, this clay of the Upper Callovian, must there be in situ at a 

 still greater height above the sea than the clay-sandstones, etc. with Cadoceras 

 Nanseni, Tchefkini and the Lamellibranchiata belonging to the Middle Callo- 

 vian. As the latter were observed above Elmwood, in situ at a height of 

 about 550 ft. above the sea, the clay of the Upper Callovian with Quenstedt- 

 oceras vertumnum must here be situated immediately, or almost immediately 

 below the basalt. According to Prof. Nansen the most commonly occurring 

 rock of the Jura underlying the basalt at Cape Flora, is clay. The report of 

 the Jackson-Harmsworth Expedition 1 records east of Elmwood "just below 

 the basalt" (only about SVa" below it) "lighter coloured, brownish clay-shale, 

 the thickness of which is not recorded". The Jackson-Harmsworth Expedition 

 found no fossils in the latter. Most probably this clay, lying above the clay- 

 sandstone and clay (with Cadoceras Tchefkini) of the Middle Callovian, belongs 

 to the zone of Quenstedtoceras Lamberti of Russian geologists. 



I cannot, of course, determine whether distinct stratigraphic limits can 

 be drawn between the Middle and the Upper Callovian in the region of Cape 

 Flora. The clay of the Middle Callovian with Cadoceras Tchefkini d'Orb. is 

 not petrographically different from the clay of the Upper Callovian with 

 Quenstedtoceras vertumnum Sintzow. Although the clays with Cadoceras 

 Tchefkini etc. occur above the clay-sandstones of the Middle Callovian with 

 Cadoceras Nanseni n. sp. etc., a limit petrographically recognisable could 

 hardly be drawn between the Middle and the Upper Callovian. We are, however, 

 not so much concerned with this matter, since our chief duty is the determina- 

 tion of the age only of the marine Jurassic strata occurring at Cape Flora. 



There are still two types of sedimentary rocks to be mentioned, belong- 

 ing to the Callovian of Cape Flora: 



1. Phosphoritic nodules. 



These were collected in various sizes, from that of a nut to that of a 

 fist, on July 14th, at the south-western end of Windy Gully, at a height 



1 E. T. Newton and J. J. H. Teall, 1. c. Quart. Journ. Geol. Soc. London, vol. LIII. 

 p. 496. 



