494 ME. M. 0DLIXG OX THE [Oct. I913, 



/'Beds Thickness in feet inches. 



8-13. Oolitic and compact limestones 8 



• I Bed 14. 'Second Terebrcdula Bed' 2 3 



2 I Beds 



g ■{ 15&16. Marly limestone (more compact towards the base) 3 

 •-? Bed 17. Limestone (the lower part being the ' Nerincsa 



W I Bock') 1 6 



I Beds 



(, 18-20. Marly oolitic limestone (full thickness unknown). 4 6 



Base of quarry. 



Geographically, this exposure occupies a position intermediate 

 between the Ardley section and the Enslow-Bridge sections. One 

 would consequently expect the thicknesses also to be intermediate: 

 on comparing the thicknesses, however, with those in the Enslow- 

 Bridge sections, we find that they are approximately identical ; the 

 decrease in thickness appears, therefore, to occur between this 

 section and the Ardley section. 



Enslow-Bridge Sections. 



There are three quarries at Enslow Bridge : the Upper Green-Hill 

 Quarry, the Lower Green-Hill Quarry, and the Gibraltar Quarry. 



Green- Hill Quarries. 1 



Two quarries are opened on the side of the hill, near Bletchington 

 Bail way-Station, the upper of which exhibits the base of the Corn- 

 brash and the top of the Eorest Marble ; the lower exhibits the 

 base of the Eorest Marble and the Great Oolite. Fortunately, 

 the upper exposure is sufficiently deep to allow of the lowest 

 beds being correlated with the upper beds of the lower quarry. 



The western end of the upper quarry is sufficiently close to the 

 lower quarry to allow of one complete section being shown in 

 the correlation-table. 



(<?) Upper Quarry (PI. XLYII, fig. 1). 



The Cornbrash is exposed to a depth of about 8 feet — which 

 appears to be almost its full thickness 2 ; the rock is very fossili- 

 ferous, and of the usual character. The lower part consists of a 

 bed of compact limestone, about 2 feet thick at the western end 

 of the quarry, and only a foot thick at the eastern end, where 

 there is a layer of rolled, concretionary, calcareous nodules at the 

 base. The following fossils are especially abundant in this ex- 

 jDOsure :■ — Homomya gibbosa Sow. (very large specimens, measuring 

 over 6 inches in length), Plioladomya deltoidea Sow., and Pseudo- 

 monotis echinata (Sow.). 



1 The upper quarry is figured in Proc. Geol. Assoc, vol. xxii (1911) pi. 

 fig. 2 ; the base of the Cornbrash has, however, been drawn too high. 



2 J. Phillips, Q. J. G-. S. vol. xvi (1860) p. 117. 



