178 
THE CRETACEOUS ROCKS OF BRITAIN. 
Below tlie kiln the following beds were seen : — 
Zone of rKloeky g re y elia,!!?:, witB °bliqu e jQinting* - 
H sub ' Hard rough brownish-grey chalk, with some fossils 
and many phosphatic nodules near the base 
7 7 I and many phosphat 
glob°sus. [ (Tottern J e . 
IT 
'•Hard bluish-grey marl, breaking with a semi-con- 
choidal fracture ------- 
-[ Dull grey sandy stone, rather hard, but splitting 
varians. into shaly layers - -. 
'-Soft grey marl without definite bedding 
Zone of 
Am. 
ft. 
6 
4 
8 
2 
8 
28 
The dip here is about 2° to the south-eastward. From Crow- 
marsh Hill the outcrop rises north-eastward, and can be found 
just above the 300 feet contour in Day’s Lane, south of Ewelme. 
The only other undoubted exposure of Totternhoe Stone seen by 
me in Oxfordshire was in the bank by the roadside, 160 yards 
south-east of Chinnor Station ; it is here about 2 feet thick, and 
contains the usual brown phosphatic nodules. 
In Buckinghamshire there is no good section through the Tottern¬ 
hoe Stone, but it is exposed in many roadways; as for instance near 
Winnall, south of Bledlow, and in the roadway north-east of Culver- 
ton, its thickness being a little over 3 feet. The top 2 feet were 
also seen in £n old pit at Parkfield, south of Princes Risborough, 
the stone here being firm and blocky, full of phosphatic nodules, 
and containing a few fossils, especially Rliynchonella mantellicma. 
At Wendover the well-head spring rises from the Totternhoe 
Stone, which can be seen in the watercourse, and thence it is trace¬ 
able for several miles along the ground above the course of the 
Wendover Canal. It crosses this near Buckland, and the top part 
of it with Rhynch. mantelliana is exposed in a small pit south-east 
of Drayton, passing up into grey chalk. 
Near Tring two beds of Totternhoe Stone have been seen, each 
between 2 and 3 feet thick, and separated by 5 or 6 feet of fissile 
sandy marl. The upper bed is more massive than the lower, which 
is somewhat flaggy, but both contain the usual brown phosphatic 
nodules.* One of these bedsus exposed in the roadway south of 
Tring Wharf, but the quarry described by Mr. Whitaker is now 
filled up. It is also visible at the northern end of the long cutting 
on the L. and N.W. Railway. 
Another exposure is in the bank of the lane south-east of Ivinghoe 
Aston. This is the upper bed, and consists of dark grey sandy 
stone (1 foot) with phosphates, and 18 inches of lighter grey stone, 
with many fossils overlain by light grey chalk. 
Exposures of the Higher Beds. —Of the chalk above the 
Totternhoe Stone in Oxfordshire there was formerly a good section 
in the upper level of the quarry at Crowmarsh, already described 
* See Whitaker iu Mem, Geol Survey, Yol. iv. p. 40, 1872, 
