MIDDLE CHALK—COAST OF DEVON. 433 
Mr. Meyer gave some description of the beds which are now 
classed as Middle Chalk in his paper on the Cretaceous Rocks of 
Beer Head.* In comparing Mr. Meyer’s account of these beds with 
the more detailed sections which are given in the following pages, 
the reader* will find that the zone of Rhynchonella Cuvieri includes 
his Beds 14, 15 and 16. The base of his 17 is marked by a layer 
of rather large black flints and this may be taken as the base of, 
the Terebratulina zone, which will then include Mr. Meyer’s 17, 18, 
19, and the lowest part of his 20. His highest bed (20) takes in all 
the rest of the visible “ chalk with flints.” 
Stratigraphioal Details. 
Zone of Rhynchonella Cuvieri. 
The lower part of this zone is well exposed at the eastern end of 
Pinhay cliffs. The higher beds are partty obscured by grass and 
talus and ’ are difficult to reach, but by piecing together small 
exposures the following descending succession was made out, the 
thicknesses assigned to the beds being only rough measurements, 
bv eve and hammer : — 
ft. in. 
9. Firm whitish chalk, massive, without flints, full of 
broken Inoceramus shells - about 15 0 
8. Soft yellowish dusty chalk ------50 
7. Rather hard yellowish chalk - - - - -100 
6. Whitish chalk, enclosing large nodules of hard yellowish 
chalk and some small flints.10 
5. Whitish chalk, exposed as a bare face, with a few small 
scattered yellow nodules - - - - - -110 
4. Massive whitish chalk, forming a vertical wall, no 
nodules - -- -- -- -- 16 0 
3. Hard yellowish chalk, full of small hard nodules - - 2 0 
2. Very hard yellowish-white limestone - - - - 1 0 
1. Very hard chalky limestone, with many grains of 
quartz and glauconite, especially in the lower part - 14 
Cenomanian. — Rubblv and sandy rock, consisting of 
quartz and glauconite grains in a chalky paste, 
with hard lumps and derived phosphate nodules 
near base - -- -- -- -0 10 
About 63 0 
Very few fossils were found here; the lowest bed passes up into 
the next (No. 2), which contains Inoceramus mytiloides and certainly 
belongs to the Rh. Cuvieri zone, as do all the succeeding beds up 
to the top of No. 7. The soft dusty chalk above this has the aspect 
of the T erebratulina zone, but the succeeding beds have the 
shelly character of the Rhynch. Cuvieri zone, so that it is difficult 
to say where the line should be drawn. If both these beds are 
excluded the thickness of this zone is about 43 feet, if they are 
included it is over 60 feet. 
A clear vertical section of the whole zone can also be seen in the 
great cleft at the western end of Pinhay cliff, where a large mass or 
* Quart. .lourn. Geol. Soc., Vol. xxx., p. 369 (1874) 
