THE LOWER OOLITES NEAR BRISTOL 
155 
Dumortieriae Beds, which maintain a fairly uniform thick- 
ness of about 50 ft. throughout the hill. 
Judging by the palaeontological evidence, these beds 
are contemporaneous with the upper portion of the Midford 
Sands, and they forcibly illustrate the possible variability 
of lithological characters even in areas not very remote 
from each other. 
The Dumortieri^ Beds can best be seen at the east 
or Maes Knoll end of Dundry Hill ; but, since there are 
no sections, and one has to depend on the weathered 
slopes for exposures, the collection of fossils at this horizon 
is a tedious and disappointing process. 
The following species may, however, be obtained : — 
Dumortieria S triatulo-costata . 
,, aff. prisca. 
,, aff. radians. 
Rhynchonella Moorei. 
Pecten inutilis. 
(2) The Inferior Oolite at Dundry. 
In order to examine the Inferior Oolite Limestone 
series of deposits at Dundry it will be best, first, to visit 
a small quarry at the extreme western end of the lull, 
on a road leading up to Castle Farm. 
The sequence at this section is as follows : — 
Section at the Western End of Dundry, near 
Castle Farm. 
ft. in. 
Thin bedded, grey, unfossiliferous limestones, extend- 
ing upwards 
Garantian^. 
Soft, brown, ironshot limestone, with derived 
nodular lumps of a dense limestone . . .05 
Acanthothyris spinosa. 
Pleurotomaria palcemon. 
