238 Correspondence — W. W. Watts. 



plete than formerly, but along the southerii side alone there were 

 at least ten quite recognizable by the craters and by the fire-reddened 

 stones with which they had been lined, though only rarely was a 

 part of the lining standing. As to stones, Millstone Grit was the 

 chief constituent, black chert, often crinoidal, was quite common, 

 but Carboniferous limestone was very rare except about the tops of 

 the kilns, where pebbles were freely scattered. Bits of good coal 

 could also be found near the pits. The general appearance of the 

 Delves is very striking and — pace Professor Gregory — unmis- 

 takable ; for the whole length of the ridge the form is quite 

 obviously artificial — dimples, craters, and trenches everywhere 

 modify the surface, one great trench runs for scores of yards parallel 

 with the northern margin. On the south side spurs project, often 

 with the crater of a lime-kiln. I confirmed my earlier imj^ression 

 that not a yard of the original form was preserved. 



There is a small isolated knoll, " Little Skirtfull of Stones," con- 

 sisting wholly of cobble-stones without infilling ; this I regard as a 

 cairn — probably prehistoric — and not a moraine mound. 



P. F. Kendall. 



CAKBONIFEEOUS NOMENCLATUEE. 



SiE, — All geologists, and particularly those connected with 

 Carboniferous geology, are grateful to Dr. E. Kidston for replacing 

 the old and provincial subdivisions of the Coal Measures by terms of 

 correlative value, dependent on their floras as worked out by 

 himself, Arber, and other palajobotanists. The words Lanarkian 

 and Staffordian are both precise and euphonious, Radstockian at 

 least precise and indicative. The fourth term, Westphalian, how- 

 ever, is not only " unconformable " to the others in having no " local 

 habitation " in this country, but differs in spirit from the rest 

 in that it seems to suggest that these, our richest measures, are 

 not typically represented in "Britain. Worse than this, the term has 

 been preoccupied since 1893, when Munier-Chalmas and de Lap parent 

 used tiie word in a wider sense, equivalent to the whole of Kidston's 

 three lowest divisions. If, as seems advisable, the use of the term 

 Westphalian in the restricted sense is abandoned, it would be 

 difficult to select one more representative than " Yorkian ", 

 particularly as its only likely rival " Lancastrian " may conceivably 

 be wanted in the end for another Carboniferous subdivision. 



W. W. Watts. 



Imperial College, S.W. 7. 

 8th March, 1922. 



THE STRATIGRAPHTCAL VALUE OF FORAMINTFERA. 



Sir, — In view of the interest now displayed in the possibility of 

 utilising the foraminifera associated with oil deposits as zonal fossils,, 



