CARTER : GLACIATION OF DON AND DEARNE VALLEYS. 413 
O.D.). In addition Mr. Tate found at Royston boulders of 
Armboth felsite, Threlkeld micro-granite, diabase, andesitic ash 
and volcanic breccia. To this list Mr. Hemingway adds rhyolite, 
rhyolitic breccia, vesicular lava, olivine basalt. Carboniferous 
Limestone, flint, and fossiliferous Lias. 
In 1904 a main drain was taken down Carlton Bank, which 
revealed many boulders of the above type. 
About half a mile south of Carlton (junction of sheets 262 
and 274) Professor Green describes a section* in which the 
Oaks Rock, dipping N.E., is covered with " blue clay, very 
stiff, somewhat gritty, without a trace of bedding (Fig. 1). 
Pebbles and blocks of Carboniferous rocks, mostly small, but 
here and there a large block ; many flat bits of black shale, 
IN. S. 
Fig. 1. 
section south of carltox, showixo boulder-clay on oaks rock 
(a. h. green). 
rounded at the edges and thickly covered with ice-scratches. 
The shales very abundant and every bit scratched on all sides ; 
coal ; Mountain Limestone, ice-scratched ; yellowish soft lime- 
stone, perhaps Magnesian ; w^hite altered flint or chert ; blue 
close-grained trap, with, small crystals of pyrites ; earthy lime- 
stone, probably Yoredale." 
(3) Barnsley. 
During the excavation for the Barnsley gasometer the 
following section (Fig. 2) was discovered and is recorded in 
Professor Green's notebook, from which I was permitted to 
copy it by Mrs. Green's kindness : — 
(1) Pale grey shale, with occasional nodules of ironstone. At 
one place there are little troughs of gravel in the top of this bed. 
* Extracted from his notebook by the kiruj permission of Mrs. Green. 
