Geology of High Teesdale. 177 
same abundance and arrangement in which they are seen in 
ordinary calcareous beds of the country. 
Of the whet-slate (Section 1. No. 4.) it is not necessary to “lobule 
speak: but there is a peculiarity in the indurated slate-clay (Sec- ae 
tion 2. No. 3.) well deserving of notice. Parts are in a state 
of great induration, and exhibit distinct traces of a globular struc- 
ture; and through the substance, may be seen many yellowish 
white spots, some of which are solid, but generally they are of 
a friable earthy texture, and de not effervesce in acids. Other 
parts of the same bed are imperfectly indurated, consisting of 
irregular layers of a hard substance like the preceding, blended 
with masses which are soft and earthy. Through every part of 
such specimens, we may often trace a number of light coloured 
globular concretions, about a tenth of an inch in diameter, which 
are rather harder than their matrix. Some masses of indurated 
shale in the Isle of Anglesea, put on an exactly similar appear- 
ance (See Professor Henslow’s Paper, Vol. I. p. 407.): but the 
globules were there of much greater interest, because they were 
sometimes of larger dimension, and on approaching a trap dyke, 
passed by a regular progression of changes imto distinct crystals. 
8. If we ascend to the top of the esearpment between Cal- Beds above 
dron Snout and Widdy Bank, we reach the upper surface of the "* *™” 
trap, and by advancing northwards, we soon find it surmounted 
by a bed of granular limestone. The plane of separation is not, 
I think, parallel to the stratification of the limestone; and in 
one place, the upper and lower beds appear on the same level, 
abutting against each other. In consequence, perhaps, of this 
irregularity in the upper surface of the trap, the limestone appears 
to be of very variable thickness. It is of a granular structure 
throughout, and from its texture and colour, might, without ex- 
amination, be easily mistaken for coarse siliceous sandstone. Each 
grain is, however, composed of crystalline carbonate of lime. 
Vol. II. Part I. Z 
