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HOLL MAI VEEN HILLS.
101-
it is to this epoch of elevatory movement (i. e. after the close of the
Lower Old Red period) that we must refer much of that tilting of
the Upper Silurian rocks which has brought them into their present^
position, although something of this is probably also due to the sub-
sequent changes of level. The faulting on the western side of the
range must have belonged to a subsequent epoch, as some of the
displacements are lateral, caused by the unequal pressure of the up-
heaved metamorphic rocks on already tUted beds.
To this epoch of elevation and denudation there succeeded one of
gradual subsidence during the age of the Coal-measures. Between
the Coal-measures and the Permian (Roth-todt-liegende ?) there is
again unconformability; and again between the latter and the Trias,
as at Great Whitney, the Permian breccia is succeeded by the Keuper
marls.
That the downthrow on the eastern side of the range, extending
from Abberly, on the north, to Newent, and thence to near Purton
Passage on the Severn, was posterior in date to the Lias, is shown
by the relative position of the latter, in the Borrow and Corse Wood
Hills, to the underlying Keuper marls and sandstones, and by its juxta-
position, north of Pui'ton Passage, with the Old Red Sandstone.
Figs. 7-10. — Fossils from tlie Upper Cambrian Rocks of the
Malvern Hills.
Fig. 7.
Fiff. 8.
7. Serpulites fistula, Holl : a, natural size ; b, enlarged.
8. Lmgula pygmcea, Salter : a, natural size ; b, magnified.
9. Oholella Scdteri, Holl : a, natural size ; b, magnified.
10. Obolella PhiUipsi, Holl ; magnified 8 diameters : a,
b, dorsal valve ; c, profile.