328 Geological Society. 



since no approach to this form, no U-like trough, was found in the 

 valleys down which the glaciers had flowed on their way to the 

 lakes. As, then, the principal features of the district appeared to be 

 preglacial, he contended that disturbances of the beds of the valleys 

 along lines transverse to their direction were more likely to have 

 produced the lakes. 



June 10th, 1874. — John Evans, Esq., F.R.S., President, 

 in the Chair. 



The following communications were read : — 



1. "On the occurrence of Thanet beds and of Crag at Sudbury, 

 Suffolk." By William Whitaker, Esq., B.A., F.G.S. 



After referring to some passages in papers by Mr. Prestwich, in 

 which the probable existence of Thanet beds in Worth Essex is 

 mentioned, the author described certain sections near Balingdon, on 

 the right bank of the Stour, which exhibit sands belonging to this 

 series. The principal section at the Great Chalk-pit, Balingdon, 

 shows, in descending order, beds belonging to the London Clay, 

 Beading beds 9 feet, and Thanet sands about 14 feet, resting on 

 Chalk. No fossils occur in the Thanet beds ; and their identification 

 is founded on the uniformity in the character of the sands, their 

 resemblance in fineness, compactness, and colour to the Thanet 

 sands of West Kent, the presence at the base of the series of a green- 

 sand resembling the " base-bed " of the Thanet sand, and the oc- 

 currence immediately beneath it of a layer of tabular flint, as is 

 usual where the Thanet sand caps the chalk. 



The Crag-beds described by the author are found on the left bank 

 of the Stour, in Suffolk, and consist of ferruginous dark reddish- 

 brown sand, with layers of ironstone, slightly false-bedded, with 

 here and there light-coloured grit with broken shells. In the lower 

 part there are layers of flint pebbles, phosphatic nodules, and phos- 

 phatized bones, which also form a bed about 1 foot thick at the 

 bottom. These beds rest on deposits belonging to the lower portion 

 of the Thanet sands, and these again on the Chalk. In one pit a 

 considerable number of fossils occur, but not in a condition to 

 enable them to be satisfactorily determined. From their position and 

 general characters these beds were referred by the author to the 

 Red Crag. 



2. " Note on a modified form of Dinosaurian ilium, hitherto 

 reputed Scapula, indicative of a new genus, or possibly of a new 

 order of Reptiles." By J. W. Hulke, Esq., F.R.S., F.G.S. 



The author reexamines Mantel's " Scapula of an unknown Rep- 

 tile "== Owen's •' Scapula of Megalosaurus ? ", and adduces reasons 

 for considering it to be a modified Dinosaurian ilium. He describes 

 two new examples of the bone in Dr. Wilkins's collection, contrasts 

 them with undoubted scapulas of sundry Dinosaurs and existing 

 reptiles, and proves their essential correspondence with the ilia of 

 known Dinosaurs. 



