1869.] MACKINTOSH—LANCASHIRE AND CUMBERLAND DRIFTS. 409
a. Upper Boulder-clay.—The existence of an Upper Boulder-clay
along the coast is clearly defined. It stretches into the interior to
an unknown distance. On the coast it thins out and disappears in
a southerly direction. A considerable thickness of it may be seen
as far south as Market Street, Blackpool, in a recess on the west side
of which this clay is now in course of being excavated (Dec. 1868).
It may be seen in the railway-cutting near the Blackpool station,
further south in the brick-pits near the National School; and I have
traced it thinning out over a light-coloured tenacious clay (Lower
Boulder-clay?) east of the old Independent chapel (see Postglacial
deposits). West of the Independent chapel, the clay now in course
of being carted away to the south shore appears to be a deeper,
Fig. 2.—Sketch-map of the Peninsula of Furness.
Boulder-clay of uncertain age,
with sand and gravel.
Glacial striae.
OF THE MAPS.
a rough idea of the distribution of drifts. Where there is no stippling, the areas the stippling in some places is extended to areas covered with earth and detritus No attempt has been made to map the Postglacial deposits.
