36 
DESCRIPTION OF THE ROCItS 
Again at Knock Ore gill head, 
Strong grit rocks 
Alternations of plate, grit, limestone, &c. 
Top of Tyne bottom limestone. 
Feet. 
j 280 
In the branches of Troutbeck the Tyne bottom 
by shales and limestones, thus : 
Scar limestone. 
limestone is covered 
Feet. 
Alternations. 
Top of (cockle shell) limestone... 
Alternations 
Broad floors of limestone (Post L.) 
Plate 
Top of Tyne bottom limestone. 
- 125 
At Middleton, 
Feet. 
Main limestone ... ... ... 50 
Grit and shale ... ... ... 84 
Underset limestone ... ... ,,, 24 
Grit (Nattriss gill hazle) ... ^ 
Plate ... ... j 50 
Three yard limestone and plate ... ... 7 
High Brigstone hazle ... ... ... 36 
From all these and other data results a general view of the succession 
of the strata in the vale of Greta and Teesdale below the millstone 
grit group : 
Main limestone 
Feet. 
70 
Various alternations 
80 
Underset limestone ... 
24 
Various, including one coal seam, one or \ 
more limestones, several plates, one or >- 
150 to 350 
two principal grit rocks, flagstones, &c. 1 
Scar limestone 
15 to 40 
Various alternations, including a bed oft 
coal, and one or more beds of lirtiestone j 
125 to 225 
Tyne bottom limestone ... , k . 
25 to 50 
489 to 839 
