436 
THE CRETACEOUS ROCKS OF BRITAIN. 
In the cliffs of the great landslip at Bindon it is again well ex¬ 
posed, and is very accessible on the south side of the great gap. 
Here the following succession was measured : — ft. in. 
Firm white chalk with frequent vertical joints, several 
Rhyne. Cuvieri - 9 0 
Firm white chalk, with a layer of black flints at the top 
and another at the base - - - - - - - 80 
Firm white chalk, weathering into rough blocks - - 9 0 
Massive white chalk with even fracture - - 3 6 
Hard rocky nodular chalk with yellow-lumps - - ^ 2 6 
Firm white smoother chalk with some small scattered 
nodules - -- -- -- -- -60 
Loose nodular chalk, with many yellowish nodules of 
various sizes, passing into next - - - - - 9 0 
Hard quartziferous and glauconitic chalk - - - 1 6 
48 6 
Here there is a complete passage from a pure chalk down into 
the glauconitic basement bed, which also is thinner than usual. 
At the west end of the landslip the basal bed, about 2 feet thick, 
separates itself from the chalk above, and contains Rhynchonella 
Wiesti in some abundance. Above it about 20 feet of nodular 
chalk is exposed. 
The most complete and most accessible section of this zone, and 
of the whole of the Middle Chalk in Devon, is that in the cliffs 
above Beer Harbour (see Figs. 78 and 79). The lowest beds are 
found at the southern end of Whitecliff, and as they are most 
conveniently examined in ascending order I give the succession in 
that way : — 
feet. 
1. Very hard rough nodular yellowish-white limestone, 
containing scattered grains of quartz and glauconite, 
especially at the base, which is clearly separated from 
the bed below (see p. 131) - - - - - - 3 
2. Hard yellowish nodular chalk ----- 6 
3. Less hard chalk with grey streaks and few nodules, in 
two beds, with a marked plane of separation (? repre¬ 
sents Beer Stone) - -- -- -- 5 
4. Bough nodular chalk, with a course of very hard 
yellowish nodules at the base - 9 
5. Nodular chalk, with a course of hard yellow nodules at 
the base and a few scattered flints near the top - 8 
6 . Hard nodular chalk, with greyish streaks, and some flints 
and a layer of yellow nodules at the top - - - 1 
7 . Hard white chalk with grey streaks, and flints and a layer 
of yellow nodules at the top - - - - - 2 -J 
8 . Softer whitish chalk, with a layer of black flints at the 
base, a few scattered flints and a layer of yellow nodules 
at the top - -- -- -- -- 71 
I take No. 7 to be the top of the zone of Rhynchonella Cuvieri, 
though some might prefer to extend it to the top of No. 8. Omit¬ 
ting it, the thickness of the zone is nearly 35 feet at Whitecliff. 
The basement bed in the above section is that which Mr. Meyer 
indicated by the number 14 in his account of the Cretaceous 
