FOSSILS OP KORTH BUCK.S AND ADJACENT COUNTIES. 481 
the deposition of the Boulder clay around the flanks of the hills — to 
an elevation in Cumberland of about 1000 feet — the land was elevated, 
and glaciers again descended the valleys and "ploughed out the 
drift." It is only on such a supposition, as deduced by Professor 
Ramsay from his observations in North Wales, that we can account 
for the existence of old moraines at levels so far below that attained 
by the Boulder clay. 
I remain, dear Sir, yours faithfully, 
Edward Hull. 
FOSSILS OF NORTH BUCKS AND THE ADJACENT 
COUNTIES. 
By J. H. Macalister. 
As the geographical distribution of fossils is always an interesting 
subject, it has occurred to me that a few words on the Oolitic fossils 
of this part of England, not much visited by geologists, may be 
acceptable to, at least, some of the readers of the " Geologist." It 
will not be my intention in this paper to treat so much of the 
geological features of the country, as to give complete lists of the 
organic remains which have been found by myself and a few others 
in the various strata of this district. The Oolites of North Bucks 
and Northampton, though of course presenting, for the most part, 
the usual character of the system as represented in other Oolitic 
districts of EiigJand (being, as they doubtless are, merely a continua- 
tion of those of Oxfordshire, &c.), yet possess several points of interest 
peculiar to themselves. The identity of the " Northampton Sands" 
(formerly classed with the Lias)* with the Stonesfield Slate of 
Oxfordshire and Gloucestershire, and constituting the Lower Zone 
of the Great Oolite, the importance of these " sands" as an iron ore ; 
the occuiTence of land-plants similar to the Stonesfield specimens in 
the Farest-marhle of the neighbourhood of Wolverton ; the extensive 
development of the KimmeHdge Clay at Hartwell ; and of the Great 
Oolite further north ; — all these facts combine to invest these beds 
with much interest, both to the geologist and the paljeontologist. 
The strata which I am about briefly to describe, and whose organic 
remains I shall enumerate, are the following : — 
upper oolites. middle oolites. 
Portland rock. Oxford clay. 
Kimmeridge clay. 
* So classed by Dr. Wright, being separated by him from the Inferior Oolite, 
which they formerly were supposed to represent. 
VOL. IV. 3 a 
