■200 



GREYWETHERS AT GRAYS THURROCK, ESSEX. 



of 6in. to a mile. The pit is that east of " Duvals," and west 

 of the road from Grays to Stifford, and the mark indicating the 

 position of the grey wethers also shows the most northerly 

 point now attained by the pit. For some yards southward, 

 however, the excavation extends downwards only to the level of 

 the top of the chalk. The height of the section shown in my 

 drawing is about 17ft. from the green-coated flints at the top of 

 the chalk to the surface. Above the green-coated fimts are 

 about 8ft. of Thanet sand, and above the Thanet sand are old 

 Thames^river deposits, gravelly towards their base and sandy 



• •-• V'^;^i^?:jS^^;;^i^^ 



<^ <aL O. 



FIG. 2. — a TOP OF CHALK ; h GREEN-COATED FLINTS ; C THANET SAND; 

 d OLD RIVER DEPOSITS ; e SURFACE. 



Height of Section, about 17 feet. 



above, both much current-bedded. Then, nearer the surface, is 

 another irregular bed of small pebbles, and above the pebbles a 

 little sand and soil. The greywether shown in place is close to 

 the bottom of the river deposits. Another was seen in a similar 

 position a few yards eastward, and a third and smaller one a 

 few yards westward, in the band of small pebbles, about 

 2ft. from the surface. Eight or nine other blocks of various 

 sizes were lying a few yards southward of the greywethers 

 shown in place, having been extracted by the workmen during 

 the progress of the excavation northward. 



I am indebted to my sons, A. R. Holmes and W. D. Holmes 

 for the photographs showing the block in place in the section, 



