part 1] SECTION AT WORMS HEATH. 9 



Of course, it was not long before the Geologists' Association paid 

 ■a third visit to the new section, and in the description of this there 

 is a view of the then most clear and interesting uprise of the Chalk, 

 from a photograph by Mr. T. W. Header. 1 



In 191o yet another excursion was made, but it called for no 

 detailed notice, as there was little change in the section, though 

 the pit had been cut back. A valuable addition to our knowledge 

 was made known by the rinding of ' a fine Micraster of the form 

 typical of the zone of M. cor-testudinarium, ' ? thus fixing the 

 Chalk exposed as well down in the Upper Chalk. 



The last printed word on Worms Heath is by Mr. Gr. M. Davies, 

 who has given the result of mineralogic examinations of loam, sand, 

 and sandstone from the Blackheath Beds and has noticed the 

 supposed allophane. 3 



The above entries, so far as I know, show all the literature of 

 the outlier, except for casual remarks and for the account of a 

 Geologists' Association excursion in November 1918. printed since 

 this paper was written. 



II. Description of the Section. 



I turn now to the consideration of the present state of the large 

 pit, by the southern side of the high road, which has furnished 

 the text of nearly all the descriptions mentioned ; the most westerly 

 part that has been recorded is also the deepest, and it is there that 

 the crimson colouring of the psbble-beds, especially shown in the 

 large mass of conglomerate, was most striking. But this part (on 

 the east) has been abandoned for some years, so that the section is 

 greatly hidden, and it will pass into a like overgrown state to the 

 older part of the pit farther south-eastwards. As a result of this 

 abandonment the brilliance of the colouring has decreased, pre- 

 sumably because the hrematitic state of the iron of the cementing 

 material has been changed, through exposure, to a limonitic one, 

 or that bright brown has mostly displaced the deep red of a com- 

 paratively fresh section. 



Just north-westward, where the uprise of the Chalk was first 

 seen (in 1908), work has also been given up more lately, so that 

 the section has become less clear. The pinnacle of Chalk figured 

 in 1910 is greatly hidden, and the larger mass some yards west- 

 ward has also suffered ; but it is still probably the best place for 

 rinding Chalk-fossils, the exposure of Chalk being larger than else- 

 where. 



Immediately westward, however, and barely divided from what 

 we may call the Chalk-pit, a most interesting section has been 

 opened up, showing some wonderful pipes in the Chalk, filled with 

 pebbles, sand, and Clay-with-Flints. The bottoms of these pipes 

 Avere not reached, and the sides, sometimes irregular but sometimes 



1 Proc. Geol. Assoc, vol. xxi (1910) pp. 472, 473, & pi. xxxiv. 



- Ibid. vol. xxvi(1915) p. 288. 



* Trans. Croydon Nat. Hist. Soc. vol. viii (1916) pp. 74, 75, 83, 92. 



