THE GEOLOGY OF THE ENGLISH CHANNEL. 151 



M. 72a. S. 23° W. Edd., 19 miles. 



Hard, cream-coloured chalk. 



Texture minutely granular. Crowded with the remains of small 

 organisms, and with shell fragments, etc. 



M. 72b. 



Hard yellow chalk. Shell fragments, small foraminifera, etc. 



M. 21c. S, 25° W. Edd., 21 2 miles. 



Hard yellow chalk. Crowded with foraminifera. There is a com- 

 paratively large circle of calcite (J mm.) having radial structure, 

 apparently the cross section of a cylinder, also sliell fragments. 



M. 14a. S. 24° W. Edd., 20 miles. 



Should have preceded M. 21c, but placed last, because in some ways 

 typical of the whole series. 



A fair-sized pebble, some three inches in length, orange- brown on 

 the outside, within distinctly yellow for an average depth of about 

 7 mm., then cream-coloured with small lighter patches. A somewhat 

 irregularly bounded area on the surface is a darker brown and more 

 compact than the rest, it is harder and stands slightly above the 

 general level. Before the pebble was broken this measured over 

 30 mm. by 13 mm. On breaking the stone it was seen to be an 

 inclusion extending 14 mm. inwards. This inclusion, viewed in cross- 

 section, is green around the margin where it is in contact with the 

 cream-coloured rock, and red in the interior and en its outside face. 

 It has small curved cream-coloured markings, the largest 4 mm. by 

 1 mm., and in grinding down a section these markings were seen to all 

 communicate with the original outer face of the inclusion ; they are 

 obviously borings made by some animal and have been infilled with 

 chalk of the same character as the body of the pebble. This is the 

 only specimen in which such a fragment has been observed, but 

 perhaps closer inspection would discover more among the samples. 



The section was cut through inclusion and general mass alike ; it 

 bears out in all respects the above description. There is a consider- 

 able similarity between the chalks forming the included fragment and 

 the body of the pebble, but in the latter there are possibly more shell 

 fragments ; foraminifera are exceedingly numerous in both, and grains 

 of glauconite are present in both. The cream-coloured rock has some 

 considerable areas of calcite in interlocked crystalline grains ; these are, 

 however, infrequent. The whiter patches in the cream-coloured rock 

 appear to be denser, to have fewer, although still very many, fora- 

 minifera, and smaller shell fragments, but there is no divisional line 

 between the two. The foraminifera include Globigerina, Textularia, 



NEW .SERIES. — VOL. VIII. NO. 2. L 



