548 ME. W. GIBSON AND DR. WHEELTON HIND ON THE [Aug. 1 899, 



33. On the Agglomerates and Tuffs in the Carboniferous Lime- 

 stone Series of Congleton Edge. By Walcot Gibson, Esq., 

 E.G.S., and Dr. Wheelton Hind, B.S., E.R.C.S., F.G.S. With 

 an Appendix on the Petrography of the Rocks hj H. H. 

 Arnold-Bemrose, Esq., M.A., E.G.S. (Read June 21st, 1899.) 



1. Historical Summary. 



Contemporaneous igneous action during the deposition of the Car- 

 boniferous Limestone has long been known and described from 

 several parts of England and Ireland. In the Annual Report of 

 the North Staffordshire Field Club for 1898 ' and in the present 

 volume of this Journal,^ volcanic activity has been described as 



Fig. 1. — Sketch-map of a portion of Congleton Edge. 



a = Limestone. 



b = Shales and thin limestones. 



c = Agglomerate and tuif. 



d = Shales, limestones, and tuffs. 



e = Shales with coal. 



/ - Grit. 



(/ = Shales and thin earthy limestones. 



h = Shales and grit. 



i = Third Grit. 



1 Wheelton Hind, ' Descr. of Section in Carb. Limest. Shales at Tissington, 

 on Buxton & Ashbourne Ey.' Ann. Kep. & Trans. IS'orth Staffs. Field Club, 

 Tol. xxxii (1897-98) pp. 114-116. 



2 H. H. Arnold-Bemrose, ' Geology of the Ashbourne & Buxton Branch of 

 the L. & N. W. By. : Ashbourne to Crake Low,' pp. 224-238. 



