496 



EEV. A. IKYING OTS A GENERAL SECTION OE THE 



(3) Mytchett Place, FHmley. — An interesting section was obtained 

 here about three years ago, particulars of which were furnished to 

 me by the engineer engaged in making the trial-boring, Mr. Eggar, 

 of Gower Street. Some specimens were preserved by the proprietor, 

 J. G. Murray, Esq., who has courteously given me every facility for 

 investigation of the matter. The following was taken from the 

 coloured diagrams and measurements in possession of Mr. Eggar : — 



Site 250 feet above O.D. level. 



1. White sand to 53 



2. Loamy sand to 65 



3. Light gi'een sand to 67 



4. Dark green sand to 93 



5. Light gi-een sharp sand ... to 180 



6. Light green and sharp 



sand, ' 'R-ith shells," &c. ... to 195 



7. Blue clay, with smooth 



pebbles to 228 



8. Green loamy sand to 230 



9. Blue clay with pebbles ... to 234 



10. Blue clay to 245 



11. Dark green sand and clay, to 262 



12. Dark green sand without 



clay to 285 



13. Brown sand, marl, and 



clay to 308 



14. Very fine sharp sand to 330 



Upper B., 65 ft. 

 Middle B., 28 ft. 



Lower B., 102 ft. 



Total of Bagshot 

 Sands 195 feet. 



London Clay, 67 feet (?). 







o; 



{►EeadingBeds f?) 68 feet. 



At this depth the tubes gave way in the " fine sharp sand," and 

 the boring was abandoned. The few specimens preserved are from 

 the last four of the above beds, and afford ambiguous evidence. 



One or two remarks, based on a comparison of the deep-weU 

 sections just described, are called for here, (i) There is in aU of 

 them a general agreement (with difference in details) of the cha- 

 racter of the strata of the three several divisions of the Bagshot 

 Series, (ii) There is an absence of all record of pebble-beds in the 

 Lower Bagshot. (iii) The Lower Bagshot beds are, in all the sec- 

 tions, characterized by the predominance of quartz-sand, coloured 

 green and grey by the presence of organic matter of vegetable 

 origin, (iv) There is an absence of any record of seams of pipe-clay, 

 which are met with frequently in beds of the Middle Division (cf. 

 fig. 1 and notes) ; and the comparative richness in clay-beds of the 

 Middle Division distinguishes it from the Lower Division. It is of 

 importance to note these characteristics of the Lower Sands in sec- 

 tions where the order of superposition (as in those just described) is 

 as certain as anything can be. 



h. Sections in which only portions of the Bagshot Seeies 



ARE EXPOSED. 



1. Railway -cuttings at Wellington College Station. — In the inter- 

 pretation of the sections exposed in the two cuttings at this spot, one 



i 



