REPORT OF THE HONORARY SECRETARIES, 1910. 165 
Home, and other members. The meeting concluded ^\-ith votes 
of thanks to the landowners for permission to \asit their estates, 
and to Mr. Lodge, of Bainbridge, for placing his local knowledge 
at the disposal of the party. An interesting programme of 
field work was arranged by Messrs. W. Home, F.G.S., and J. Harts- 
hom. On Friday, June 18th, an excursion was made to the 
Gap of the Bain to see the havoc wTought by a flood two years 
ago, after which Semmerwater and Parker Gill Force were visited, 
and, on the retum route, the " British Dwellings " on Addborough 
Top and the denudation on Scar Top by the storm of 1908 were 
examined. On Saturday, June 19th, Mill Gill, Wliitfield GiU, 
and Whitfield Crags (Askrigg) were visited, and on the retum 
joumej' a detour was made to Skell Gill. On the following Monday 
the Scars of Ellerkin, Xappa, and Catleap were visited. 
The Autumn Meeting was held at the Queen's Hotel, Sunder- 
land, under the Chairmanship of the Rev. C. T. Pratt, M.A., in 
the unavoidable absence of the President. The leadership of the 
party was in the capable hands of Dr. David Woolacott, of New- 
castle, who has made a careful study of the district. The sections 
from Hendon to Ryhope with concretionary and flexible lime- 
stones, intmded and slickensided breccias, and the Lower Per- 
mians at Claxheugh were examined on Friday, September 16th, 
and on the following day the coast sections from South Shields to 
Marsden were visited. At the General Meeting an address was 
given by Dr. Woolacott, who explained that he had lately been 
able to prove that the extensive brecciation that forms such a 
marked feature of the Magnesian Limestone in Durham had 
been produced by horizontal thmsts acting roughly between the 
north-west and south-west directions. This pressure had 
shattered the strata and displaced large masses, and also developed 
extensive fracturing, folding, clea\4ng, slickensiding, and other 
stmctures that are characteristic of thmsted regions. In some 
cases the breccias have been forced into the beds above, and, in 
one place at least, into the bed beneath. In his examination 
Dr. Woolacott had found it necessary to re-classif}^ and re-map the 
principal beds of the north-east of Durham. The most interesting 
fact brought out by this survey was that the Shell Limestone of 
Howse or King was a shell-bank of the Permian sea. During their 
visit he had been able to show the party the whole of the divisions 
