Morris — Gravel Beds at Flnchley, 



411 



sea-bottom of Kimmeridge-clay. Such troughs I believe to be not 

 uncommon in districts bordering upon extensive spreads of the 

 Bouhler-clay. 



I have made notes of sections seen in two Boulder-clay pits at 

 Gillingham in Norfolk, and at Bulchamp in Suffolk, which illustrate 

 the manner in which the sea-bottom has been eroded by icebergs, 

 and the cavities filled with Boulder-clay. In the instance at Bul- 

 champ, which I saw with Professor Liveing last summer, the sea- 

 bottom has consisted of sand, of an age some degree anterior to 

 the Boulder-clay. This case has been, like that at Ely, adduced as 

 an instance of faulting ; but we noticed sand of the same character 

 as that at the side of the section, clearly continued beneath the clay. 



In the other case the Boulder-clay has been originally deposited 

 upon the same sand, but has been subsequently itself eroded down 

 to its very base, and the channel filled again by a fresh deposit of 

 slightly different materials. 



Ground Plan of the Ely Clay-pit. The width from N. to S. is exaggerated, 

 (o) Lower Green-sand. {d) Chalk. 



\h) Kimmeridge clay. (e) Gault (?) 



(c) Erratic clay, with boulders of granite, if) Lower Green-sand. 

 Oolite, large flints, etc. \gh) Line of junction. 



V. — Note on the Gravel Beds of Finchley. 

 By Professor Morris, F.G.S. 



THE gravel beds of Finchley, which belong to the Drift or Boulder- 

 clay series, have yielded to the researches of Mr. N. T. Wether- 

 ell, of Highgate, many specimens of Flints, containing fossils of the 

 Chalk formation, — of these, the genera Inoceramus and Pecten are 

 most abundant, associated with which are casts of Ammonites, and 

 specimens of Terehratula, Rhyncho7ieUa, Dianchora, Lima Hoperi, Spon- 

 Sylus spinosus, and man}'- Echinoderms, as Micraster, Cardiaster, 

 (similar to one from Northfleet,) two or three species of Cidaris, 

 Ci/phosoma, Ananchijtes, Galerites, but with these it is important to 

 notice there are sometimes found silicified specimens of Venericardia 

 planicosta, a condition in which these shells are rarely found in their 

 original Eocene beds. It may be further interesting to notice that 



