282 Reports and Proceedings — 



hardly a single instance has the same species been found in two 

 distinct localities, a fact which may perhaps be accounted for by 

 the beds not being exactly sj'nchronous, and the author thinks that 

 the insect remains will prove of more value in the marking of 

 distinct horizons than the plants with which they are usually 

 associated. Another feature is the number and extraordinary pro- 

 portion of species each so far represented by a single specimen, 

 and, again, that no inconsiderable proportion of the species must 

 be referred to genera no longer existing. 



The excellence of Dr. Scudder's work is too well known to require 

 comment, and this present volume is an additional proof of the 

 immense labour and zeal which he brings to his herculean task. 

 Its importance will be fully recognized by all paleeontologists on 

 this side of the Atlantic, and its promised further continuance will 

 be gladly welcomed. 



Geological Society of London. 

 L— April 8, 1891.— Dr. W. T. Blanford, F.E.S., Vice-Presi- 

 dent, in the Chair. — The following communications were read : — 



1. "The Cross Fell Inlier." By Prof. H. A. Nicholson, M.D., 

 D.Sc, F.G.S., and J. E. Marr, Esq., M.A., Sec.G.S. 



The tract of lower-PalEeozoic rocks lying between the Carboni- 

 ferous rocks of the Cross-Fell range and the New Eed Sandstone 

 of the Eden Valley is about sixteen miles in length, and little more 

 than a mile in average breadth ; the Inlier extends in a general 

 N.N.W. and S.S.E. direction, and the normal strike of the rocks is 

 about N.W. and S.E. The tract is divided along its entire length 

 by a fault, which separates the Skiddaw Slates (with the Ellergill 

 Beds of one of the authors and the Milburn Series of Mr. Goodchild) 

 from higher beds on the west. A detailed classification of the 

 Skiddaw Slates is not attempted, but the authors describe the suc- 

 cession of the rocks in the faulted blocks of the western portion. 

 Their classification is as follows : — 



Coniston Grits = Ludlow. 



Coniston Flags (lower portion) ="Wenlock. 



Stockdale Shales= Llandovery-Tarannon. 



Ashgill Shales. ^ 



Staurocephalus Limestone. I 



Dufton Shales and Keisley Limestone. V = Bala. 



Corona Beds. i 



Ehyolitic Group. -' 



A brief comparison of these rocks with those of other regions is 

 made by the authors. 



Two Appendices are added. One by Mr. Alfred Harker, M.A., 

 F.G.S., contains petrographical notices of certain sedimentary and 

 volcanic rocks in the Skiddaw Slates, of the volcanic rocks of the 

 Eycott and Ehyolitic groups, and of the principal varieties of 

 intrusive rocks. The second, by Mr. A. H. Foord, F.G.S., contains 

 a description of some Cephalopods from the rocks of the Inlier. 



