50 



ME. H. W. MOKCKTON ON THE 



years. In 1870 the section seems to have shown 6 feet or more of 

 green sand between two clay beds, the whole forming the Middle 

 Bagshot, and resting on fine, nearly white sand, Lower Bagshot.^ 



About the end of September 1881 

 farther into the hill to the west and showed : 



the workings had been carried 



Northern end of Section. 



ft. in. 



Surface earth 6 



1. Yellow laminated sand and 



clay 3 6 



3. Grreensand 7 



11 



Southern end of 



ft. in. 

 Surface earth 1 



1, Yellow laminated sand and 



clay 3 6 



2. Yellow more clayey bed 



passing down into a finely 

 laminated liver-coloured 



clay 6 6 



4. Grreen laminated clay more 



or less sandy 3 6 



14 6 



On Peb. 18, 1882, the writer visited the locality with Mr. E. H. 

 Wright, who made a sketch of the northern face of the pit. The 

 section showed: — 



0. Earth. 



00. Changed bed of yellow sandy clay, 2 ft. 6 in, 



1. Yellow and grey clay in laminae evenly bedded with white and green sand' 



from 7 ft. 4 in. on the east to 9 feet on the west, where there is a bed of 

 light-coloured sand with very little clay at the base. 



2. The wedge-shaped bed of green sand 3 ft. 6 in. at the east end of the face 

 and thinning away to nothing on the west, so that bed 1 rests on bed 3. 



3. Very dark, nearly black laminated clay, with a good deal of green sand in 

 many places ; the clay tinged red in places ; bottom not shown. Much 

 iron pyrites and traces of plant-remains. 



The fine white sand of the Lower Bagshot was dug at a somewhat 

 lower level. I visited the section in company with Dr. Irving on 

 Aug. 19, 1887, and found it had been cut much farther back into 

 the hill and was one of the finest sections of the Middle Bagshot I 

 have seen. We made careful measurements, and the details have 

 been published by Dr. Irving, Quart. Journ. Geol. Soc. vol. xliv. 

 (1888) p. 166. The wedge-shaped bed of green sand, which was- 

 7 feet or more thick in 1881 and was seen to thin to nothing in 

 1882, doubtless represents the green sand full of casts of shells so 

 well seen in the railway-cutting close by (to the S.E.), and the bed 

 no. 4 of the Goldsworthy section. Besides this wedge-shaped bed 

 there are many small patches and scattered grains of green sand 

 throughout the Middle Bagshot Beds of the section, while green sand 

 occurs in the Tower Hill brick-field to the west, and signs of it are 

 found on the Ascot Hills to the north-west. 



The writer ventures to suggest to Mr. Hudleston that an attempt 

 to draw the line between the wedge of green sand and the dark clays 

 which contain patches of green sand would be very un satisfactory y. 

 and it is far better to include them, as Prof. Prestwich does, in the 



1 See Mem. Geol. Surv. vol. It. (1872) p. 332. 



