185 
out. Southwards, and still higher up the hill, we enter the 
quarry called by the workmen the “ Rolling-bank.” In Sheet 44 
of the Geological Survey this escarpment is marked “tumbled 
Oolite and undercliff,’ names which alike indicate the disturbed 
condition of the beds, produced probably by a slip of the Oolitic 
strata over the unctuous clays of the Upper Lias. 
The Lower Trigonia Grit, which is seen in situ on the plateau 
above, has here rolled over and formed the glacis of the hill, it 
has thereby covered the beds of the “Humphresianus Zone” 
which immediately underlie it. Recent workings having more 
fully exposed these “ Humphresianus” beds than formerly, I 
have collected therefrom, a series of fossils characteristic of the 
“Fauna” of this zone—and have lately ascertained the strati- 
graphical sequence of the beds composing this middle division of 
the Inferior Oolite in the northern Cotteswolds. 
The “ Rolling Bank Quarry” is capped by about 18 inches 
of the “Lower Trigonia Grit,” composed of loose incoherent 
fragments of a light coloured Oolitic limestone, beneath which 
are exposed the uppermost beds of the ‘* Humphresianus” zone, 
consisting of 
No. 1.—The Phillipsii-bed—is a light buff coloured, compact 
earthy limestone. Many of the blocks are composed of the 
shells of Brachiopoda, of which that of Terebratula Phillipsii 
greatly predominates. The bed measures from two to four feet 
in thickness, and contains, 
Lima proboscidea—Sow. 
Pecten — 
Terebratula Phillipsii. 
—— perovalis, 
—— carinata. 
— Buckmanni. 
Rhynchonella spinosa. 
— tetrahedra. 
No. 2.—The Roadstone-bed—consists of a coarse brown fer- 
ruginous oolitic limestone, extremely hard and crystalline, in some 
parts traversed by sandy layers, in others, containing calcareo- 
siliceous concretions, which have a crystalline structure and un- 
even fracture; it forms a durable road-material, and is raised for 
that purpose. The bed varies from 10 to 15 feet in thickness, 
and contains a small assemblage of Mollusca, which are nearly 
all in a state of moulds; a few species have their tests preserved. 
The Trichites are very large, and sometimes well preserved in the 
rock, but cannot be extracted entire. Pholodomya Heraultii— 
Ag., attains likewise a gigantic size. The following species occur 
in the bed :— 
Cephalopoda, 
Ammonites d’Orbignana—Wr. Brogniarti d’'Orb. non. Sow. 
