WESTLETON BEDS TO THOSE OF NOKFOLK, ETC. 133 



Similar beds were passed through at various cuttings between 

 this point and Bulford ; but it was between Black Notley and 

 Brain tree that the section of greatest interest was exposed. 

 The cutting, which is 25 feet deep, showed the Chalky Boulder- 

 clay resting upon a deeply indented surface of coarse Glacial gravel, 

 much contorted. This latter had likewise ploughed heavily into 

 the underlying light-coloured Westleton sands and shingle, which 

 were regularly stratified in horizontal layers, and intersected by a 

 number of small faults of | to 3 feet throw, which did not pass 

 upwards into the Glacial Beds (PL VII. fig. G). 



The shingle consisted mainly of small flint- and white quartz- 

 pebbles with a few subangular flints. jS^o fossils were found. The 

 overlying Glacial gravel . consisted of large worn flints and some 

 Chali-cUbris, with pebbles of sandstone, of red quartzite (N.E.S.), 

 and some small pebbles of flint and white quartz, the latter probably 

 derived from the underlying beds. (See explanation of PI. YII. 

 p. 152). 



The Westleton Beds were again exposed at the ballast-pit near 

 Braintree Station. They are there much more ferruginous than 

 usual, and are deeply indented by the overlying Glacial clay and 

 gravel. In one part of the pit the section was as under (fig. 9) : — 



Fig. 9. — Railway hallast-jnt, Braintree {south end) (1848). 



h' 



c 



feet. 



a. Brown clay with subangular flints... | ^ ^^^^^^^^ ^^^ 



0. Verj^ chalky JBoulder-ciay > looil 



6'. Ochreous Grravel (Grlacial) J 



(c. Finely stratified white sands and gravel, yellow 

 in the lower part 13 

 c'. Coarse dark ochreous gravel, with ferruginous 

 concretions 4 



The shingle consisted of the following materials, placed in the 

 order of their relative abundance : — ■ 



1. Flint-pebbles. 



2. Pebbles of white quartz. 



3. Subangular fliut-fragmcnts. 



4. Subangular fi-ap,inents of cliert and ragstone. 



5. Large flattish light-coloured quart zite-pebbles. 



6. Subangular pieces ol" Tertiary sandstone and puddingstone. 



7. Small Lydian stones and pieces of white quartz. 



Beneath c\ a hole sunk at the bottom of the pit showed S feet of 

 interstratified white and yellow sands, with a shingle composed 



