MIDDLE CHALK— CAMBRIDGESHIRE. 471 
are very irregular in shape, and many of them are long, narrow, 
cylindrical' and root-like. G-alerites subrotundus, Terebratulina 
gracilis var. lata , Rhynchonella sp. (small), and Inoceramus mytil- 
oides ? were found here. The same beds are also exposed in the 
next cutting to the north (Mutlow Hill). Some of the beds are 
tinner than the others and stand out in the weathered face. 
A quarry in the central part of the zone is open near Westley 
Lodge, east of Six Mile Bottom Station on the Newmarket Line. 
In 1880 this showed : — 
feet. 
White chalk without flints - - ~ - - - 12 
Thin seam of grey marl. 
White chalk full of finger-like flints of various sizes, with some 
larger and thicker flints - -- -- -- 5 
Near Dullingham Bailway Station is a pit in the higher part of the 
zone with Micraster and Holaster planus. It is about 20 feet deep, 
the upper 10 feet containing many Hints of various shapes and sizes, 
but there are none in the lower part. 
The highest beds of this zone are shown in a pit south-west of 
Westley Waterless and again in a quarry by Underwood Hall, 
north-west of Westley Waterless, where they include two thin 
layers of tabular or continuous Hint. 
The following list of fossils is based upon those given in the 
Memoir on the Neighbourhood of Cambridge, with a few altera¬ 
tions and additions:— 
List of Fossils from the Middle Chalk. 
Zone of 
B. 
Cuvieri. 
Zone of Ter. gracilis* 
Lower. 
Upper* 
Pisces. 
Protosphyrsena ferox, Leidy - 
X 
Ptychodus deciirrens, Ag. - 
X 
— 
— 
Cephalopoda. 
Scaphites Geinitzi, d'Orb. - - - 
— 
— 
X 
Lamellibranchiata. 
Exogyra sp. 
X 
— 
- 
Inoceramus Brongniarti, Sow. - 
— 
- 
X 
Cuvieri, Sow. 
— 
— 
X 
,, mytiloides, Sow. 
X 
X 
— 
Ostrea vesicularis, Lam. - 
X 
X 
X 
,, semiplana ? Sow. 
- 
— 
X 
Pecten Beaveri, Sow. - 
- 
— 
X 
Spondylus latus, Sow. - 
X 
X 
X 
„ spinosus. Sow. - 
i 
X 
