264 PROCEEDINGS OF THE GEOIOGICAL SOCIETY. [Mar. 22, 



portant addition to the geology of the neighbourhood, the mapping 

 of the London Clay here *, the only part of France, I believe, where 

 it has been found. 



In the following description the same numbers have been used 

 for the same beds in the two sections noted, as far as could be. 



Westward from Dieppe, along the top of the cliff, there are great 

 hollows and pipes of Tertiary sand and drift, with many slips, the 

 clearest giving the section below : — 



1. Grave], of subangular flints and flint-pebbles. 

 3. Oldhaven Beds ? ■ Fine light-brown, buff, or light-grey sand. 

 (4:. Laminated brown clay. 

 6. Shelly clay, with a thin layer of shelly stone, over 2 feet. 



(Light grey (whitish) sharp sand, with ferruginous layers, about a 

 foot. 

 Grey and brown clayey sand, with peaty layers, especially at bottom, 

 about a foot. 

 ''' 8. Sharp rather coarse sand, whitish just at top, the rest pale greenish 

 and yellowish grey, veith iron-stains near the bottom. Some small 

 green-coated flints, and at the bottom a layer of them (9), 6 or 7 

 feet, resting evenly on 

 10. Chalk with flints, but not with such marked layers of them as occur a lit- 

 tle below. 



Further westward the ground faUs to the vaUey of the small river 

 Scie. Beyond the next gap, which is small, there is at the highest 

 part a great hollow, of drift loam, flints, and pebbles, and of the 

 Tertiary beds. All have fallen much, right down to the beach ; but 

 at the top at one spot I saw above the fine sand (3) a mass of clay, 

 the lowermost part brown and sandy, the rest of a dark greenish grey, 

 like the bottom London Clay-of East Kent. There may be a fault 

 here, as the Tertiary beds seem to abut against the Chalk. 



At the top of the cliff beyond the next gap, also small, there was 

 at the time of my visit a very good section reaching for a long way, 

 and showing the following beds.: — 



1. Flint-gravel. 



(Evenly bedded alternations of dark-grey and brown shaly clay, 

 brown sand (some like that of the Oldhaven Beds), and loam, 

 12 or 15 feet. 

 ^'■"■j ■ I Brown clayey sand with thin layers of clay, drying hard, 5 or 

 l^ 6 feet? 

 3. Oldhaven Beds. Fine light-coloured evenly bedded sand, at one place 

 with a bed of iron- sandstone more than a foot thick. Over 25 feet. 

 (The beds below much slipped and not easily to be seen, so that some may 

 have escaped notice, for instance No. 4. of the former section.) 



/'5. Shelly clays, much thicker than before, evenly bedded, di- 

 j vided into two by a dark-grey and greenish clay. 



1 A little dark clay with layers of sand. 

 Lignite and peaty clay. 

 A little grey and ferruginous clay. 

 ■"^"'" 8. Sharp buff sand, with concretionary masses of greywether- 

 sandstone (as noticed by Mr. Prestwich) and a few flints. 

 9. Flints in what seems to be a greenish clay (inaccessible) fill- 

 ing small pipes in 

 10. Chalk. 



* The Greenough Geol. Map of England, south-eastern sheet, 1865. 



