3o8 GEOLOGICAL SURVEY REORGANISED CHAP, ix 



March 1871. 



MY DEAR GEIKIE I write a second note. If you 

 refer to my book on North Wales, you will see that I 

 state that the Lingula Flags and Cambrian are con- 

 formable, and pass into each other, and that the 

 Llandeilo and Bala beds lie unconformably on both. 

 Officially I still call the Lingula Flags Lower Silurian, 

 because of the Director- General's classification, but 

 theoretically I consider the Lingula Flags more 

 closely allied to the Cambrian. In the first paper 

 I sent you you will see, however, that I consider 

 the Cambrian (below Lingula Flags) as a fresh-water 

 formation. The Llandeilos and Balas are, however, 

 nearly as closely connected with the Tremadoc Slate 

 and Lingula Flags as the Upper Silurian is with 

 Llandeilo and Bala beds. The Tremadoc Slate I 

 consider an upper part of the Lingula Flags. Ever 

 sincerely, A. C. RAMSAY. 



KING'S ARMS, KENDAL, 

 ist October 1871. 



MY DEAR GEIKIE I'm smoking a pipe on a 

 Sunday. Hallelujah, hallelujee ! I send you my two 

 last [papers on Red Rocks] to Edinburgh, not knowing 

 where you may be. I have had a very pleasant letter 

 from De Koninck about them. He will write again, 

 but at present he seems equally surprised and pleased. 

 Besides twelve sent here and there in England, I 

 think I will devote the rest of my copies to Conti- 

 nentals and Americans, for Englishmen can read them 

 in the Journal. . . ; 



I came here last Tuesday, and, weather permitting, 

 have been daily among the Silurian Green Slates 

 and Porphyries. The more I see of them, the more 



