422 
THE CRETACEOUS ROCKS OF BRITAIN 
height above the layers of green-coated nodules, so that probably 
this flint band should be taken as the real base of the Upper Chalk. 
Dr. Rowe visited the locality in 1899, and found no difficulty 
in getting access to the whole of the Middle Chalk on the 
eastern side of White Nothe, or in estimating the thickness of 
each zone, but his prime object being to distinguish the zones he 
does not give complete stratigraphical details. He describes the 
zone of Rhynchonella Cnvieri as consisting of hard nodular 
chalk, and makes its thickness, measured up to the first line of 
flints, 76 feet. His zone of Ter. gracilis comprises first some thick¬ 
ness of “ less nodular ” chalk, with frequent marly layers, then a 
band of nodular chalk about 5 feet thick enclosing layers of green - 
coated nodules, and finally a certain thickness of nodular chalk. 
The total thickness of the zone is given as 58 feet, this being 
measured up to a certain layer of marl, above which the fauna of 
the Holaster planus zone comes in. 
Combining this information with Mr. Strahan’s note of the 
fallen mass it would seem that the succession at White Nothe 
may be formulated as follows 
Upper Chalk. Zone of Hoi. planus. feet. 
f Nodular chalk with a few scattered flints - - - 15 
AT' 111 Nodular chalk with layers of green-coated nodules - - 5 
pi i| r e / Smooth chalk with occasional flints, passing down into 
' ' ' rougher chalk with a layer of flints at the base - - 38 
I Zone of Rhynch. Cuvieri ; hard nodular chalk without flints 76 
134 
Most of the accessible portions of the cliff are much battered b}^ 
the waves, but from a bluff of the chalk above that with the 
green nodules, Dr. Rowe obtained a fair number of fossils. 
Dossils from the Middle Chalk of South Dorset. 
In the following list of fossils those collected by Mr. J. Rhodes 
are indicated by the letter x, those recorded only by Dr. Rowe bv the 
letter R, and a few found only by Professor Barrois by the letter B. 
\ 
Terebratulina zone. 
Zone of 
Rhymli. 
Cuvieri. 
Below 
green 
nods. 
In & above 
green 
nods. 
Pisces. 
Ischyodus sp. - 
1 1 
B 
Ptychodus sp. - 
- 
- 
X 
Cephalopoda and Gasteropoda. 
Ammonites [Acanth.] Cunningtoni, Sharpe. 
X 
- 
- 
„ [Pachydiscus] peramplus, Mant. 
X 
- 
- 
Solariella gemmata Sow. (“Turbo”) 
■' - ■. 
- 
X 
Lamellibranchiata. 
Inoceramus Brongniarti, Sow. 
X 
X 
X 
„ Cuvieri, Sow. 
X 
R 
„ mytiloides, Sow. - 
X 
R 
- 
Lima Hoperi, Sow. ----- 
— 
B 
„ semisulcata, Nilss. - - - - 
— 
X 
— 
Ostrea curvirostris, Nilss. 
X 
— 
— 
„ hippopodium, Nilss. 
X 
R 
R 
„ normaniana, d'Orb. 
X 
R 
R 
„ vesicularis, Lam. - 
- 
X 
- 
