The Quarterly journal of the Geological Society of London (12736309613)

472 R. HARKNESS AND H. A. NICHOLSON ON THE STRATA BETWEEN
Fig. 3. — Diagram showing the vertical Succession of the Silurian
Strata in Slelgill BecJc, near Ambleside.
Base of the Coniston Flags (Broughton-
Moor Flags), with Monograpfus colo-
nics, Retiolites Geinitzianus, &c.
Knock beds. Greenish slates with den-
drites, casts of a small Orthis, &c.
a
Graptolitic Mudstones, with numerous
Graptolites and other fossils. At a is
the lowest Graptolitic band resting
directly upon the limestone ; and
immediately above it (b) is a grey
band full of Brachiopods.
a. ii -.j 11 n ii r
I) L.
I) if (I If I) I) II II
ii ii
X-IiJL
ii
Coniston Limestome proper, consisting of
shales alternating with bands of lime-
stone and layers of calcareous concre-
tions. The shales are highly fossili-
ferous.
i
h
.^
Summit of the Borrowdale series, c is a
thin band of ashes representing the
Style-End Gi-assing beds. It is full
of spots of peroxide of iron and rusty
cavities, apparently due to the decom-

position of fossils.