MIDDLE AND WESTERN ENGLAND AND SOUTH WALES. oon 
Mountain Limestone against which it rests. It appeared then, as 
during the present year, when I again visited the spot, to be a drifted 
bed, perhaps only a patch, and very likely derived from the conglo- 
merate beneath the typical Lias of the district, which had been 
thrown against the slope of the Mountain Limestone previously to 
the deposition of the Lias proper, and with which the latter became 
mixed and blended. The woodcut which acompanies the late Mr. 
Moore’s account of the Brocastle beds seems rather to represent such 
a deposit than a more continuous one. It was probably redeposited 
where we see it now almost coincidently with the Lias, the fossils 
of which, such as Gryphites, were then freely mixed up with it. 
That it differs greatly from the Sutton Stone I shall now proceed to 
show. 
An examination of the Sutton Stone in the coast-section will be 
attended with much more satisfactory results. The best place for 
examination is ab a spot a few yards westward of ‘‘the caves,” 
which are between Sutton and Southerndown, at which place a 
vertical linc would, according to my view, pass through the follow- 
ing series of beds :— 
feet. 
]. A series of beds of true Lias and shale, at the bottom of which is the 
fucoid bed mentioned by Mr. Bristow. Between this series and the 
following is a thin layer of chert, the fragments of which are over- 
grown by specimens of Plicatula intusstriata...........-.0000000- about 60 
2. Hard conglomeratic stone in layers, and containing a considerable 
GENOME CN Gh ci. sci aicts ot. sivas. oneciss anise sade Seat shasta a ome es eects 8 
3. Sutton Stone, highly conglomeratic, but sometimes fine-grained. It 
is divided into two parts, the upper one being about 12 feet, and the 
lower one about O)feet im thickness ...........-.0..--ce0esdeeeecter- about 20 
4. Mountain Limestone, on the upturned edges of which the Sutton 
Stone was deposited. 
Of the beds forming the upper two thirds of the section, I need 
only observe that their lower limit is clearly defined by the fucoid 
bed mentioned by Mr. Bristow, and by the line of fragmentary chert 
noticed both by him and by Mr. Tawney. But of the series 
numbered 2, it is necessary to state that, although very decidedly 
conglomeratic, it is unquestionably true Lias, and that it contains 
characteristic Liassic fossils. The lower series, numbered 3, that is 
to say the Sutton Stone, is quite distinct from the overlying conglo- 
meratic beds, and contains, according to my observation, a distinct . 
series of organisms. My conclusion, after a careful examination, 
accords pretty closely with what has been shown by Mr. Tawney in 
his horizontal illustration of the coast-section, in which the Sutton 
Stone is seen to occupy but a short distance along the coast-line, and 
to dip eastward out of sight, only again to become visible when 
brought up by a fault at Dunraven Point, at which place it is dark 
in colour and hard*. At a spot only a very short distance from 
Dunraven Point eastward the same sequence of beds may be seen 
as at the caves near Sutton. It is not essential to my purpose to 
enter at length into the details of the physical geology of this coast- 
section, my present object being in great measure answered by the 
* Mr. Bristow also, in the paper already referred to, substantiates the east- 
ward dip of the Sutton and Southerndown beds. 
OE 
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