BEDS OP THE LONDON - BASTN. 349 



The railway- cuttings at Goldsworthy Hill, at Ascot, and at 

 Wellington College afford good type sections in the lower part of 

 these beds, and show that the above subdivisions, though varying 

 in thickness, are very persistent. The Goldsworthy-Hill section 

 was described by Prof. Prestwich in 1847 (Quart. Journ. Geol. Soc. 

 vol. iii. p. 382). 



The subdivision C in the above table is there represented by a 

 " coarse greenish sand with a few flint pebbles " two feet thick ; the 

 subdivision D by Prestwich's bed 2, foliated clays eleven feet ; E by 

 his beds 3, 4, 5, eighteen feet ; and F by his beds 6 and 7, fifteen 

 feet thick. 



A very similar section was opened a few years ago on the branch 

 of the South- Western Railway between Ascot and Bagshot, 7j miles 

 north-west of Goldsworthy Hill. Starting from Ascot station, the 

 line passes over Lower Bagshot Sand for about three quarters of a 

 mile ; the middle Bagshot clays then come in, and are well shown in 

 a brick-field close to the railway. This brick-field was described 

 in the Memoirs of the Geological Survey (vol. iv. p. 332) ; but sub- 

 sequent excavation has greatly improved the section. 



The overlying fossiliferous beds are exhibited in an adjoining 

 cutting on the railway, which was measured by Mr. William Hemes 

 and myself in 1879 (Geol. Mag. iii. p. 171); it is now much over- 

 grown. 



Section on tlu South- Western Railway, near Ascot. 



B* 1. Fine light-yellow sand. ffc ' in ' 



2. Yellow sand with layers of darker-coloured iron-sand 2 6 



3. Pebble-bed, with rolled flint pebbles in iron-sand matrix often 



greenish 10 



D 4. Yellow sand with layers of iron-sand, passing into a finely foliated 



sandy clay, with patches of yellow and greenish sand ...about 10 



5. Layer of flint pebbles 2 



E 6. Yellow and liver-coloured foliated sandy clay 3 



7. Green sand with a little dark clay, casts of shells abundant in 



a layer of yellowish sand 8 or 9 



Fusus longcBVUs, Lam.; Fusus, ? sp. ; Volnta, ? sp., like V. cithara, Lam.; 

 Pleurotoma, ? sp. ; Natica sp. ; Turritella sulcifera, Lam. ; Phonos aggluti- 

 nans, Lam. ; street flab ellulum, Lam. ; Pecten corneus, Lam. ; Cardita carinata, 

 ? Sow. ; C. planicosta, Lam.; Cardium pondosum, Brand. ; Protocarelium 

 semistriatum, Desh. ; Cytherea nitielida, Lam. ; C. suberycinoides, Desh. ; 

 Corbida gallica, Lam. ; C. striata, Desh. ; Gastrochama cor allium, Sow. ; 

 Serpula, sp. ; and wood. 

 F 8. Clays and clayey green sand, shown in a brick-field near the railway, 

 where the beds exposed are : — 



Liver-coloured and yellow clay laminated with white and green sand. 

 A wedge-sbaped bed of green sand. 



Nearly black foliated clay with iron pyrites, vegetable impressions, 

 and wood, 18 to 20 ft. 



Fine white Lower Bagshot Sand. 



At Hagthorn Hill, f mile to the north-west of the above brick- 

 field, there is a pebble-bed 2 feet 6 inches thick, apparently in 

 nearly the same relative position as that numbered 3 in the railway- 



* The letters in this and the following table refer to the table, p. 348. 



