188 Correspondence — D. Machintosk. 



in ^Norfolk. He detailed tlie several papers which he had read at 

 the Meetings of the British Association at Nottingham, Brighton, 

 and Bradford, in proof of the existence of a Forest-bed in Norfolk 

 and Suffolk, which he called the Anglo-Belgian basin, of a succession 

 of growths of forests, and of alternate elevations and depressions 

 which have taken place in that region, and argued thence by analogy 

 the extreme probability that such existed in the Carboniferous epoch. 

 He relied upon the fact that such coal-deposits would be at a work- 

 able depth, in consequence of the elevation of the land at Hunstanton 

 about 1700 feet above its original position at Yarmouth; and this 

 upheaval of the chalk afforded a complete refutation of Prof. Hull's 

 statement, founded on the supposed dip of the slaty rocks of the 

 Harwich boring, namely, that an old Palasozoic land-surface extended 

 from Harwich over all the Eastern Counties into Scandinavia, as 

 represented in his Map, appended to the Keport of the Coal Com- 

 mission, and that this old high and dry surface was incapable of 

 coal-growth. Mr. Gunn submitted that, if the southerly dip of the 

 Harwich slaty rock extended in a northerly direction, it must have 

 been reached at the Norwich boring, which was sunk considerably 

 lower than that at Harwich, and did not pierce through the Gault. 

 Mr. Gunn dwelt especially upon this as the most serious objection to 

 the prospect of reaching coal at Hunstanton, or rather a Carbon- 

 iferous bed, an opinion expressed so strongly by the Professor at the 

 meeting at Brighton. Mr. Gunn also referred to the evidence of 

 local subterranean movements in proof of the proximity of disturb- 

 ances acting upon what he regarded as a thin envelope of Tertiary and 

 Secondary deposits, probably not exceeding 1000 feet, and perhaps 

 much less. He referred to the evidence of boulders, which he hoped 

 to adduce on a future occasion, 



2. — " On the Geology of Nottingham." By the Eev. A. Irving, 

 B.A., F.G.S. Part I. 



coisi^Esi^on^iDiBn^rGE. 



ME. JAMES GEIKIE ON SCOTCH AND ENGLISH DEIFTS. 

 SiK, — Those who have read Mr. J. Geikie's papers in Yols. VIH. 

 and IX. of the Geol. Mag. will perceive that in his new work called 

 " The Great Ice Age " he has changed his opinion concerning the 

 correlation of Scotch and English Drifts. Instead of lumping to- 

 gether the three great drifts of the N.W. of England as varieties of 

 " Till," he now agrees with the opinion I published in the Geol. 

 Mag. for Sept. 1872 (Vol. IX.), namely, that "the eskers of Ireland 

 and kames of Scotland were piled up during some part of the [N.W. 

 of England] middle sand and gravel period," and that the upper or 

 brick clay is the representative of the Scotch shelly clay. This 

 change of opinion has, I fancy, enabled Mr. Geikie to correlate more 

 readily the drifts of this country with those of Sweden and America. 

 Mr. Kinahan, in the last Number of the Geol. Mag., does not believe 

 in the existence of a decided upper Boulder-clay in Ireland. In the 



