MIDDLE CHALK—COAST OF DEVON. 445 
higher beds are inaccessible. On the west side of this there is a 
small fault with upthrow to the west, and in the next bluff the 
following succession is seen : — 
feeh 
Hard rocky clialk (Chalk Rock) 
Soft white chalk with a few flints, Holaster planus found near 
the top, and Ter. gracilis var. lata common throughout - 20 
Soft white chalk in massive beds, with many finger-shaped 
flints - seen for to 
The visible thickness of the zone is not more than 40 feet unless 
the 20 feet of underlying chalk without flints is included (see p. 432); 
but as there is a fault, and the beds cannot be measured in vertical 
succession, it is possible that there is more than 40 feet in the bluffs, 
and this suspicion is confirmed by what is seen further west. 
The upper beds of this zone are seen at the base of the bluff 
which is known as Chapel Rock. 
The whole zone and that of Rhynchonella Guvieri are exposed in 
the great cleft formed by the breaking away of a large slice of the 
cliff at the west end of Pinhay cliffs. This section was measured 
by Dr. A. Rowe in 1898, and he kindly allows me to publish the 
results, which are as follow : — 
feet. 
Zone of Terebratulina - - - - - - - -72 
„ of Rhynchonella Cuvieri- ------ 56 
„ -of Ammonites Mantelli - - - - - - - 5j 
Here, therefore, the Middle Chalk is 128 feet thick. 
The Terebratulina zone can also be examined in the cliffs below 
Whitlands Coastguard Station, and it forms the highest part of 
the cliffs south of Rousdon for the distance of nearly a mile. It 
does not, however, come into the Bindon cliffs nor is it seen 
again between them and Axmouth. 
West of Seaton the whole of the zone is brought in again by 
the great syncline at Beer; it is visible at the southern end of 
Whitecliff (see Fig. 77), but is most accessible along the north 
side of Beer Harbour (see Fig. 78). The section here has been 
described in detail by Prof. Barrels, and I could recognise his 
enumeration of beds without difficulty up to his No. 33, but 
above that we do not agree. The following is an upward con¬ 
tinuation of the section given on p. 436. 
feet. 
9 White chalk with many black flints and some yellowish lumps 
(Barrois 21).3 
10 Soft chalk without flints (Ter. gracilis var. lata), passing 
up into chalk with flints (B. 22, 23).7 
11 Soft chalk with many flints, both scattered and in layers, 
Ter. lata is common (B. 24, 25, 26) - 8 
12 Nearly continuous layer of black flint (B. 27). 
13 Marly chalk veined with grey, no flints - 3 
