ree ae SS 
Notes on a Geological Section between Tytherington and Thornbury, 
by the Rev. H. H. Winwoop, M.A., F.G.S. 
Read November 20th, 1888. 
Sir Roderick Murchison in “ Siluria,” ch: XXXIV, p. 452, 
when writing of the rocks of the Tortworth district, describes 
the Carboniferous Limestone to the S. of Tortworth as “thrown 
up in a horse shoe outline from beneath the Millstone Grit and 
Coal Measures, while near Tytherington it rises like a wall from 
beneath the Cromhall coal-field.” He alludes also to a sub- 
ordinate band of reddish sandstone, the “ Firestone” of the 
country people. In the preceding page he incidentally mentions 
that the Dolomitic Conglomerate to the BE. of Thornbury rests 
directly on the coarse Conglomerate of the Old Red Sandstone, 
the beds of the older being almost as horizontal as those of the 
newer Conglomerate. Since the above was written in 1838, 
railways have done much to open up fresh sections in that 
district, and the branch line running between Yate and Thorn- 
bury, has cut through a series of beds in the Carboniferous 
Limestone and the Old Red Sandstone, second only in import- 
ance to those in the well-known and classical Avon gorge. 
Having visited this section several times with Professor Lloyd 
Morgan during the past and present year, it was our intention 
to have prepared a joint paper for the Meeting of the 
British Association in Bath, giving the results of our obser- 
vations. With this object in view, we had measured the 
beds, and had several specimens of the rocks prepared for 
microscopical examination. Circumstances however, interfered 
with this intention, and it is left for me to put a few notes 
together to illustrate the remarkable geology which I had the 
honor of pointing out to those Members of the British Associ- 
ation who visited that locality on the afternoon of Saturday, 
September 8th. 
x 
