Reports and Proceedings—Geological Society of London, 327 
only an accidental allusion in one case—when the Ipswich Museum 
and Library are spoken of. Surely some knowledge of Geology, 
using that term in its widest sense, is both of educational value and 
technical importance in every district, to say nothing of its extreme 
usefulness in mining and agricultural centres, and we trust that Mr. 
Greenwood will in future editions be able to say something in favour 
of the study of that science which next to chemistry has the greatest 
influence over the affairs of our every-day life, and thus supply what, 
to us, seems the one omission in his admirable volume. 
cee @Oievoe SAN) a ee @ Cree eG Se 
———————— 
GEOLOGICAL Society oF Lonpon. 
I.—May 9, 1888.—W. T. Blanford, LL.D., F.R.S., President, in 
the Chair.—The following communications were read :— 
1. “The Stockdale Shales.” By J. E. Marr, Esq., M.A., Sec.G.S., 
and Prof. H. A. Nicholson, M.D., D.Sc., F.G.S. 
The Stockdale Shales extend in an E.N.E.-W.S.W. direction 
across the main part of the Lake District, parallel with the under- 
lying Coniston Limestone Series and the overlying Coniston Flags, 
with both of which they are conformable. 'They also occur in the 
neighbourhood of Appleby, and in the Sedbergh district. They are 
divisible into a lower group of black and dark grey and blue Grap- 
tolite-bearing shales, interstratified with hard bluish-grey mud- 
stones containing Trilobites and other organisms, and an upper 
group of pale greenish-grey shales, with thin bands of dark Grap- 
tolitic shales. The lower group (Skelgill Beds) are well seen in the 
stream which runs past Skelgill Farm, and enters Windermere near 
Low Wood; while the upper group (Browgill Beds) occurs fully 
developed in the Long Sleddale Valley, and its beds are very 
fossiliferous in Browgill. 
The authors divide these shales into a series of fossil-zones in the 
following order :-— 
BS 2 
Upper { Bb 1 
( Browgill Beds { Ba 2 zone of Monograptus crispus. — 
IBaplaen. 55 ‘5 turriculatus. 
( Aci ,, Rastrites maximus. 
Stockdale lee 4 -,,  <Acidaspis erinaceus. 
Shales Upper 4 Ac3  ,, = Monograptus spinigerus. 
| Ac2 ,, Ampysx aloniensis. 
| Ae 1 Monograptus Clingani band. 
( Ad 6 Barren band. 
\ Skelgill Beds 4 | Ab 5 zone of Monograptus convolutus. 
: IND 4D! Phacops glaber. 
Middle Ab 3 s Monograptus argenteus. 
Ab2 > ,, Enerinurus punctatus. 
{Ab1  ,, Monograptus fimbriatus. 
Aa 2 Dimorphograptus confertus. 
Lower 22 . : . 
( Aal Diplograptus  acuminatus and 
Atrypa flexuosa. 
Of these zones, the lowest varies, occurring as a thin Limestone 
