Mr. R. H. Tiddeinan on the Ice-sheet in North Lancashire. 233 



tween Shepherd's Bush and Hammersmith, and in the neighbour- 

 hood of Turnham Green, which resulted in the discovery, at the 

 latter place, of a large quantity of animal remains (noticed by Mr. 

 Busk in the following paper), all of which, like the implements of 

 the high terrace, were at the bottom of the gravel ; but no evidence 

 of human workmanship was found in the mid terrace. 



All these were found together, in the same seam of gravel, 12 

 feet beneath the surface ; and all appeared to have been deposited at 

 the same time. The surface was here 25 feet above the Ordnance 

 datum, and consequently about 50 feet lower than the implements 

 of the high terrace, 1| mile to the north. The section across the 

 valley, taken through the two places, here shows the strip of the 

 London Clay intervening between the two terraces. 



The chief points of interest which 'the author submitted to the judg- 

 ment of geologists, consisted in : — the presence of drift implements 

 in the high terrace, their absence in the mid terrace, and reappear- 

 ance in the existing bed of the Thames ; the great rarity or absence 

 of animal remains in the high terrace, and their abundance in the 

 mid terrace ; and the occurrence of both implements and animal re- 

 mains at the bottom of the gravel in both terraces. The writer 

 concluded by adducing proofs of the great antiquity of the present 

 river-bed, which it was shown must have run in its present mean- 

 dering course in the bottom of the valley for at least 2000 years. 



3. " On the Animal Remains found by Col. Lane Fox in the 

 High- and Low-level Gravels at Acton and Turnham Green." By 

 George Busk, Esq., F.R.S., E.G.S. 



The author described the mammalian bones referred to in the 

 preceding paper. 



The remains from the High-level Gravels at Acton belong to the 

 genera Bos, Ovis, Equus, and Elephas ? The greater part belong to 

 the first-named genus, and are probably modern, as are also those 

 of Ovis. The remains of Equus may be of greater antiquity. The 

 other bones found may belong either to Elephant, Rhinoceros, or 

 Hippopotamus ; they include a large portion of an Elephant's 

 molar, and are much rolled. 



The remains from the mid-level gravel at Turnham Green gene- 

 rally present the characters of great antiquity. They include bones 

 of Rhinoceros hemitcechus, Equus caballus, Hippopotamus major (one 

 of them the left frontal of a very young animal almost unworn), 

 Bos (probably B. primigenius, and some perhaps Bison priscus), 

 Cervus (G. clactonensis, Ealc. = (7. Broivni Dawk., C. elaphus, and 

 O. tarandus), Ursus ferox priscus, and Elephas primigenius. 



4. " On the Evidence for the Ice-sheet in North Lancashire and 

 adjoining parts of Yorkshire and Westmoreland." By R. H. Tidde- 

 man, Esq,, M.A. Oxon, E.G.S., of the Geological Survey of England 

 and Wales. 



The country of which the earlier glacial phenomena were de- 



