f urtber Worh on tbe Silurian IRocfcs of tbe 
Eastern fIDentripa. 
By S. H. Reynolds, M.A., F.G.S. 
IN the Silurian Inlier in the Eastern Mendips, which was first 
described in 1907, 1 three main lithological types were met 
with, viz. : — 
1. Pyroxene-andesite forming an Eastern or Downhead mass, 
and a Western or Moon's Hill and Sunny Hill mass. 
2. A peculiar coarse ashy conglomerate exposed in two areas, 
one lying between the two andesite masses, and a second at the 
western extremity of the inlier. The relations of this deposit to 
the other strata were not clear, but of the various possibilities 
the most probable seemed to be that it represented two necks 
or vents. 
3. Tuffs fine and moderately coarse, the former containing a 
fauna of Silurian, probably Llandovery, date, were seen at Sunny 
Hill to dip below the andesite, and were exposed by trenching at 
several points along the south-eastern boundary of the inlier. 
A band of tuff was also found interbedded in the andesite at Sunny 
Hill. 
In the latter part of 1907 fresh sections in fossiliferous Silurian 
rocks were exposed to the S.E. of the Moon's Hill quarry owing 
to the laying of a line of rails from the Downhead quarry ; and 
at the Leicester meeting of the British Association in 1907, a 
committee was appointed to further investigate the Silurian rocks 
of the Bristol area and of the Mendips. Under the auspices of 
this committee a series of trenches was dug and some fossils 
collected, which were determined by Mr. F. R. Cooper Reed and 
assigned by him to the Llandovery. No tuffs were met with in 
the area to the S.E. of the Moon's Hill quarry, the prevalent 
rock being a somewhat sandy mudstone. 
A tuff band was, however, found interbedded in the Moon's 
Hill andesite. No further information was obtained as regards the 
nature of the coarse ashy conglomerate. The report of this com- 
mittee was published in the Dublin (1908) volume of the British 
Association Reports, pp. 286 — 289. 
Further work 2 has since then been carried out, and points of 
interest have been ascertained in both the Moon's Hill and 
Downhead areas. 
1. — The Moon's Hill Area. 
During 191 1 sixteen trenches were dug in the area to the 
S.E. of Moon's Hill. The position of the trenches is shown in the 
1 Quart. Journ. Geol. Soc. Vol. LXIII. (1907), pp. 217-240. 
2 An account of this work was brought before the British Association at 
Portsmouth in 1911, and a short report appears in the volume for that 
meeting, p. 381. 
