312 



DR. A. M. DAVIES AND ME. J. PKINGLE ON [June I913, 



3-3 



302 





Unconformity. Thickness Depth 



in feet inches, in feet inches. 



( Soft greenish-grey shales, red-stained 

 in places, particularly on the joint- 

 faces. Dip varying from 65° to 70°. .36 6 480 

 Soft dark-red and green micaceous 

 shales : fragments of Clonograptus (?) 



at 490 feet 13 6 493 6 



Soft greenish - grey shales, passing 

 downwards into grey shales : Clono- 



graptus at 496 feet 2 6 496 



Jointed grey micaceous shale, with 

 two sills of olivine - basalt at 570- 

 572 feet and 606-608 feet. 

 Clonograptus and Obolella abundant 



j at 498, 517, and 530 feet. Be- 

 tween 481 and 500 feet the shales dip 



J steadily at an angle between 65° and 



' 70° ; at 555 feet the dip decreased to 

 49° : Clonograptus, Obolella. About 

 600 feet, abundant Clonograptus and 

 Obolella. At 635 feet, dip =44°: 

 Clonograptus. At 740 - 742 feet, 

 graptolites and Obolella. At 783 

 feet, dip =49°. At about 845 feet, 

 dip=40°, rising locally to 80° : Clono- 

 graptus. At 961 feet, worm-castings. 

 At 1135 feet, dip=51°. At about 

 1165 feet, dip =4S°: abundant frag- 

 ments of graptolites. From 1180 to 

 1220 feet, the beds are almost vertical. 

 At 1280 feet, dip=59°. At 1398 feet, 

 harder rock touched, no cores drawn 



{ (igneous rill?) 902 1398 



Total apparent thickness 954 



(a) Jurassic Bocks. — (i) Oxford Clay. [J. P.] 



Owing to the state of the cores, it was impossible to secure exact 

 details of the Oxford Clay passed through in the Eastern Borehole. 

 The information obtained from the borer's journal, however, shows 

 that grey and blue clays, some of which were hard and tough, were 

 met with to the depth of 95 feet. Below this point was a hard, tough, 

 brownish clay, full of broken shell-fragments and some lignite; and 

 from this portion of the core the following fossils were obtained : — 



Lignite. 



Gryphcea bilobata J. de C. Sow. 



Belemnites oweni Pratt. 



Cosmoceras sedgwicki (Pratt). 

 Cosmoceras stutchburyi ? (Pratt). 



In Messrs. Itter's brickyard — the site of the Western Borehole — 

 a fine section is obtained of nearly all the beds passed through in 

 the Eastern Boring, and from this locality Dr. Davies & Mr. E. 

 Neaverson, B.Sc, of Aylesbury, collected, among other forms, 

 Cosmoceras elizabethce (Pratt) and C.jason (Beinecke). Erom these 

 forms, and from the evidence furnished by the lowest bed of Oxford 



