BRITISH ISLES. 35 



the whole of Portland was under water. There are notes on other 

 Drift deposits in the district. One of these, near the summit of Black- 

 down (over 700 feet above the sea), is probably older than the mam- 

 maliferous Drift of Portland, and may belong to some part of the 

 Glacial period. There are notes on the shells of the Drift by Mr. 

 J. Gwyn Jeflfreys, and on the bones by Prof. Busk. W. T. 



Price, F. G. H. On the Lower Greensand and Gault of Folkestone. 

 Proc. Geol, Assoc, vol. iv. no. 2, pp. 135-150. 



The Hythe Beds are briefly mentioned. The Sandgate Beds (80 ft.) are 

 divided into 4, the lowest of which is the zone of lihyyichonella sulcata. 

 The Folkestone Beds (70 ft.) are in four divisions : — 1 (lowest), thin, and 

 with phosphatic nodules ; 2, clayey sandstone, 2 ft. ; 3, 60 ft. of calca- 

 reous sandstone and sand ; the highest is the zone of Ammonites mam- 

 miUans, it contains masses of grit and phosphatic nodules. The Gault 

 is divided into 11 zones. Descriptions and lists of fossUs of these are 

 given. (See Geological Record for 1874, p. 31.) W. T. 



. On the Probable Depth of the Gault Sea. Proc. Oeol. Assoc. 



vol. iv. no. 5, pp. 2G9-278. 



From an examination of its Mollusca, the author concludes that the 

 Gault of Folkestone was deposited in an area which sank more rapidly 

 than the sediment accumulated, so that the sea was constantly deepen- 

 ing. The lowest bed contains littoral and rolled shells ; the maximum 

 depth of the clayey Lower Gault sea was probably much under 100 

 fathoms ; the LTpper Gault is marly, and appears to have been deposited 

 in a deeper sea. W. T. 



Reade, T. M. The Glacial and Post-Glacial Deposits of Garston 



and the surrounding District, with Remarks on the Structure 



of the Boulder Clay. Proc. Liverpool Geol. JSoc. vol. iii. part 1, 



pp. 19-27. 



Resting on a floor of 'Biinter Beds is red sand, with embedded masses 



of rubble, which the alithor terms ''Ground Moraine," and believes 



to be the equivalent of the Scotch Till. Resting on it is the " Low 



Level Marine Boulder Clay and Sands," reaching a maximum depth of 



1G9 feet below the surface, and due to tidal sorting. C. E. DeR. 



Roberts, Isaac. President's Address. Proc. Liverjoool Oeol. Soc» 

 vol. iii. part 1, pp. 3-18. 



Describes the Glacial Drifts as representing long successive intervals 

 of time and conditions of climate during the period of their deposition. 

 Ko marine organisms occur in the true Till, which is crowded with 

 local fragments of rock ; while the overlying Boulder Clay, which is 

 more or less distinctly bedded, contains marine shells and erratic 

 scratched pebbles, generally rounded, and rises to a height of from 200 

 to 260 feet above the sea in the Liverpool district. C. E. DeR. 



Eobson, Dr. J. S. Anniversary Address. Proc. BervncTc. Nat. Club, 



vol. vii. no. 2, p. 163. 

 Notes on the glacial geology of Coldingham on p. 175; glacial strite 

 running N. or N.N.W. were observed on the rocks. 



D2 



