18 



MR. a. W. LAMPLrGH OX THE JUXCTIOX OF [vol. Ixxviii, 



recent rock}'' shore or tidal reef in strata of unequal induration. ^ 

 These features are illustrated in the following enlargement (fig. 9) 

 of part of the preceding section. 



Fig. 9. — Enlarged section of ilie guttered iron-grit crags slioivn 

 in tlie 'Western 'part of Jig. 8, p. 16. \_Same explanation as 

 for tliat figure?^ 





Scale: Vertical and Horizontal 

 12 3 4 5 feet 



The soft calcareous patches, partly phosphatized, occurring at 

 intervals among the ironstone-breccia in the Nine Acre sections 

 are at the same horizon as the limestone-lenticles under Shenley 

 Hill, and, though more decomposed, are like the lumps which 

 occurred on the northern and southern skirts of the limestone- 

 masses in the former workings of Chance's and Garside's pits. 

 Traces of fossils were noticed in them in two or three cases, but in 

 too poor a state for recognition (except in one instance as casts of 

 brachiopods). If the pit should be pushed northwards under a 

 thicker cover of Gault, it is probable that the section will yield 

 better palseontological material at this horizon. 



On the east, the Nine Acre workings reach the roadside near 

 Miletree Farm, beyond which, on the other side of the road, another 

 pit (' Miletree pit ') affords practically an eastern continuation of 

 the section, while a separate excavation ('Miletree Farm pit') is 

 worked northwards at right angles to this. I first saw and noted 

 these sections in 1909, and have a few particulars gleaned on later 

 visits. Work is still in progress in both pits, but large portions of 

 the former exposures are now obliterated. The most striking feature 

 is the reappearance of a thick wedge of the stratified Siltybeds (2) 

 above the Silver Sands in Miletree Farm pit (fig. 11, p. 20) and their 

 tailing out southwards at the entrance to the pit. This feature 

 has been described and figured diagrammatically by Dr. Kitchin 

 <fe Mr. Pringle {pp. cit. p. 57). The Silver Sands are unconsoli- 

 dated beneath these Silty beds, but become indurated into bosses 



1 Examples might be cited of similar features at many other geological 

 horizons, but the closest parallel in age and structure is presented by certain 

 of the French ' Tourtias.' The Palffiozoic floor beneath the ' Tourtias' is in 

 some places guttered and scoured in almost exactly the same way as here : 

 see H. Parent, ' Sur TExistence du Gault entre les Ardennes & le Bas- 

 Boulonnais ' Ann. Soc. Geol. Nord, vol. xxi (1893) figs, on pp. 207 & 212. 

 See also i^p. 56-57 of the present paper. 



