106 PROF. GROOM ON THE CAMBRIAN AND [Feb. 1902, 
varieties of the White-Leaved-Oak Shales ; but, on the whole, the 
distinction in colour between the two series is very marked. 
The Bronsil Shales have already been divided into? :— 
(4) Upper Grey Shales ; 
(3) Coal-Hill Igneous Band ; 
(2) Lower Grey Shales ; and 
(1) Middle Igneous Band. 
The shales of the lowest band are nowhere actually exposed, 
the intercalated basalts alone being visible; but plenty of shale- 
débris is associated with the latter along the north-eastern border of 
Pendock’s Grove, and more is seen on the ridge lying north-east of 
Coal Hill. Fossils appear to be rare, and are obtainable only with 
great difficulty in the small pieces of shale available. The only kind 
found was a small imperfect Lingulella, from the north-eastern corner 
of Pendock’s Grove (M231). The total thickness of the series is 
about 300 feet. 
The overlying Lower Grey Shales, some 250 feet thick, are 
also very imperfectly exposed. They may be seen at the corner 
of a cottage-garden towards the foot of Chase-End Hill, but no fossils 
were detected here. In the débris (M 252) south of the garden two 
imperfect lingulelliform brachiopods were obtained, and at another 
spot to the north-east a species of Lingulella was found. In both 
places many examples of Vomaculum problematicum, gen. et sp. nov. 
(figs. 832-35, p. 126) were collected. 
The sedimentary beds of the Coal-Hill Band consist chiefly of 
Grey Shales, frequently baked yellowish-white, or much indurated. 
A good exposure of these may be seen in the garden of Coal-Hill 
Cottage (M182), at the north-western end of Coal Hill? Other 
exposures are seen along the path immediately above the cottage, 
and along the same path at the south-eastern end of Coal Hill. 
Sections of some of the upper beds are also to be seen in a cottage- 
garden by the roadside south of Coal Hill, and at a point onthe road 
a little farther south (M261). In all these exposures the shales are 
interbanded with thin sills of diabase. Fossils are rare; but in the 
dark-grey shales at the spot last mentioned, and in the débris from 
the upper light-coloured beds of the band along the path skirting 
the south-western border of Coal Hill, Dictyonema sociale, Salt., 
was obtained. The spot last-mentioned also yielded to the Rev.G. E. 
Mackie aspecimen of Linnarssonia Belti( Dav.) and numerous examples 
of Tomaculum problematicum. In the shales which accompany one 
of the Bronsil igneous bosses (M 248), and probably immediately 
underlie the basalt, numerous specimens of Doactyonema sociale,’ 
1 Quart. Journ. Geol. Soe. vol. lv (1899) p. 159. 
* Ibid. pp. 158 ete. 
’ These and other specimens have been kindly examined for me by Miss E. | 
M. R. Wood, who has provisionally identified them with Salter’s species. 
