Geology of High Teesdale. 149 
The great limestone (Teesdale Section, No. 21) appears in the north 
bank of the river above Eglestone Bridge; and after traversing 
some ground where the relative position of the strata is much 
disturbed by faults, it is again well exposed about a mile and 
a half above Eglestone, in the side of the high bank called 
Foggerthwaite, near which place a large quarry is opened in it. 
From thence it may be followed without difficulty through the 
mid region of the mountains on the north side of the valley. 
On the south side of the Tees, the great /imestone is seen, 
at a considerably higher elevation, gradually rising above the 
village of Mickleton into the brow of the hill which overlooks the 
Exrract from Forster’s Section, 2d Edit. p. 169. 
No. Yds. Ft. In. No. Yds. Ft. In. 
169. Scar Limestone..........-- 10 0 0 NEEM Eva ak aee 3, Bae eed 1) 40 
UOMIP late waco .yc foes owe ere ee 1 Ot? O) NSA Hazlerscntcccdeasccsceeseee ee OO 
Be AAZIGN A sac has Aedeeecmace sts) li OO IRS Plater .c.% «nistemairs ve crocs: tous Ls 20 
VP Goal sictetid yee Suoe Neiieweie whe O70) G, 186. Single Post Limestone...... GO} Mey fe) 
Adar Dlaterssne steers sicic.ce%e «ee 0's eG DEES MELE ae Srereaetuctorir nigh GaecR 1P=0r 0 
L(AnAZIed gine lt. seclscmes-ceieetos Stare OO USS Greystone’ .--.--.s2\c2e5) 1 OO 
ire WEDS 3 op Sop ABaUS. Oooo aD WyLOF 0 189. Plate and Grey Beds.,..,.. 18 0 0 
N70.) ehagleae sed dest lereeccescsee O° 2.10 190. Tyne Bottom Limestone.,... § 0 0 
NZ. 7s Mnlateisey adele Godless clelsiete:o vials 3) OF 0 191. Whetstone Bed.,.......... 1 0 0 
WSs Hazlewet se cdssesciscasc cast) Oe? 0) MG 2 iltin Silleete ese teeee se it 40) 0) 10 
W7O-UBlatere.pchre eet oe tie le eave o* "250 LOSI ates) ergs uate wees ce oe to Seal Ola 9) 
USO Hazler ees eee et ONO LOAM Hazletss Mi iteoce eecctecaee OP ENN 
181. Cockle Shell Limestone ..... 0 2 0 NOFe Plates. piekic tems les S20 
NS QMsHazlew saiaatatie ects e's eters -fale ¢ oO 2 6 196% Hazle eects seeeees 32 «6 
By comparing this extract with the latter part of the general section of the strata 
of High Teesdale, we see at once the impossibility of reconciling all the successive terms 
of each series. It is undoubtedly true, that we find in both sections, a great bed of 
trap interposed between the other strata. The details do not, however, by any means 
demonstrate that this bed of trap has a given place in a regular series of deposits. Those 
who have contended for the aqueous origin of the great Whin Sill, because it occupies 
a fixed place in a regular succession of aqueous deposits, found their chief argument 
on an assumption, which is not justified by any of the sections which have been published, 
