404 Rev. T. G. Bonney—On the Boslyn Rill Clay Pit. 



side shows a cliff of nearly horizontal Kimmeridge Clay, which at 

 the western end is capped by a little Tipper Neocomian, generally 

 more or less disturbed. A small step, some three feet high, may be 

 observed here in the Kimmeridge Clay, marking probably some in- 

 equality in the process of erosion. This Kimmeridge Clay extends 

 about half-way round the western end of the pit, and we then j&nd 

 a fine exposure of Boulder-clay, the junction of the two being 

 indicated by springs, but masked by boggy talus overgrown with 

 brushwood. Near the south-western angle we again come upon the 

 Upper Neocomian sands ; then we have, after an interval of broken 

 ground, a little Chalk, Upper Greensand with phosphatic nodules, 

 Gault, some Boulder-clay, and Kimmeridge Clay, which forms the 

 greater part of the southern wall of the pit. Finally, on the eastern 

 side we have Boulder-clay, Gault, Upper Greensand, Chalk, as 

 before, and then an opening. The annexed sections (Figures 1-4) 



Se6tions of Pit. 



Pig. I. 



Fig. II. 



Fig. III. 



Fio. IV. 



2. ^^^ 



'"''i--'''''''^ 



■^ 



1 6 



A 







B 



1 ^ / 





6 





c 



3 





D 



\l^ 



^-/ 



5 



^^-^ 



E F 



h \ 



1 





^S 



For explanation of reference numbers see Fig 5. In Figs. 1-3 the sections 

 commence on the southern side and do not extend across the whole pit. 



will, I hope, make this above-mentioned strange succession of beds 

 more intelligible than a long verbal description. They relate to 

 three portions of the pit : ' 



(1). The south-western corner. Fig. 4. 



(2). The middle of the southern side, Figs. 2 and 3. 



(3). The south-eastern comer. Fig. 1. 



On the eastern face of the angle which, terminates the cliff of 

 Boulder-clay we have at the top a mass of Gault about seven feet 

 thick. Its bedding appears to dip (but this is very faint) towards 

 the left and into the cliff. The mass is rather cracked, and shows 

 internal slickensides in two directions; one, to some extent parallel 

 with its lower boundary, the other roughly vertical and at right 

 angles with the surface. It contains many phospihate nodules and 

 fossils, Perna, Belemnites, etc. The Boulder-clay dips clearly under 

 this (as shown), and exhibits a faint stratification j)arallel with its 

 surface, for some depth. The uppermost layer is very chalky, like 

 some of those below, and the surface shows slickensides. Its left 



