740 PROF, REYNOLDS AND MR. VAUGHAN ON THE | Nov. 1902, 
than Bajocian types. In many respects these limestones bear a strong 
resemblance to the top (or Coralline) beds of Dundry Hill, where 
T. globata, of the typical Fullerian form, occurs associated with corals 
very similar to those found in our tunnel-section.? 
The Sandy Limestone-Beds (Passage-Beds). 
The exact horizon of these hard beds cannot be definitely settled 
from the actual rock-specimens preserved from this shaft (No. 4), 
for these specimens contain no fossils. Rocks of exactly similar 
texture, however, occur at several levels in the shafts farther 
east, and it seems certain that these thick limestone-beds pass 
laterally into a series of alternating clays and hard limestones, in 
which the relative thickness of limestone and clay varies con- 
siderably from point to point. This deduction is based on the fact 
that, in each of the shafts farther east (numbered 3 & 2), there 
is a thickness of about 40 feet of clays and hard hmestones, which 
occupy a position exactly analogous to that of the hard sandy 
limestones of Shaft No. 4: for they rest upon clays full of Ostrea 
acuminata, and are capped by beds of massive oolitic limestone. 
The specimens of these beds derived from Shafts No. 3 and No, 2 
contain fossils at more than one horizon, so that, from these 
specimens, the stratigraphical position of this series can be approxi- 
mately determined. 
Paleeontologically, these sandy limestone-beds seem to bear a 
closer relationship to the Great Oolite than to the Fullers’ Earth, 
for large specimens of Pholadomya deltowdea (very similar to the 
common Cornbrash form) are common, while no specimen of Yere- 
bratula globata or Ostrea acumimata was found in them. 
These beds probably occupy the same horizon as the Stonesfield 
Slate, but they do not bear a close resemblance to that series, either 
in lithological or paleontological characters: for the limestone, 
though sandy, is not fissile and the faunal facies is very distinct. 
We have simply designated them ‘ Passage-Beds’ in our tunnel- 
section. 
The Fullers Earth. 
This consists of a thick series (about 90 feet), mainly of clays 
and shales. When traced laterally, the lithological character is very 
inconstant, for the clays pass, on the one hand, into shales, and, on 
the other, into beds ot hard shelly marl. In the middle of the 
series, however, there are one or more beds of argillaceous limestone 
which mark a fairly constant horizon. 
The clays and marls are crowded with Ostrea acuminata, while 
Avicula echinata, Terebratula globata, Rhynchonella varians (of the 
1 Mr. J. W. D. Marshall permits us to state that he has found typical 
Fullers’-Earth fossils in what appears to be a pocket at the western end of 
Dundry Hill ( Ornithella cadomensis, Rhynchonella varians, Terebratula globata, 
ete.) ; and one of us has also obtained there a specimen of Ostrea acuminata. 
