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Ordinary Meeting, April 4th, 1882. 
R. Angus Smith, Ph.t)., LL.D., F.RS., &c., in the Chair. 
“ On the Occurrence of Oxide of Manganese (Wad) in the 
Yoredale Rocks of East Cheshire,” by Arthur Smith 
Woodward, Student of Owens College. Communicated by 
Dr. Charles A. Burghardt. 
I. — Introduction . 
One of the most noticeable geological features of the 
eastern part of Cheshire is the enormous fracture forming 
the boundary between the carboniferous and new red sand- 
stone formations, and known as the Red Rock Fault. This 
fault has a direction N.E. and S.W., and, according to the 
Memoirs of the Geological Survey, extends from a little to 
the N. of Stockport to Talk o’ th’ Hill, in Staffordshire, a 
distance of about 80 miles. In the more northern part of 
its course superficial evidence of its existence is either ex- 
ceedingly scanty or entirely wanting, owing to the thickness 
of the glacial drift deposits which characterise the district 
through which it passes ; but as it approaches Macclesfield 
there are slight indications at the surface of its presence, 
and as it continues south of this town the superficial evidence 
gradually becomes greater and more definite. Here there 
are considerable eminences on the western side of it, con- 
sisting of triassic strata not obscured by glacial drift, and 
hence the fault itself becomes visible at the surface. 
Between Poynton and a locality about three miles south of 
Macclesfield it is bounded on its eastern side by the carboni- 
ferous formations in succession, — the two lower divisions 
of the coal measures being most northern, next five divisions 
of the millstone grits, and below these, more to the south, the 
Proceedings — Lit. & Phil* Soc.— Vol. XXI.— No. 9.— Session 1881-2. 
