232 GEOLOGICAL SURVEY IN SCOTLAND CHAP, vn 



great St. David's lump of trap. There are all kinds 

 there, unseparated and only indicated by one colour. 

 Once you get to Llandovery I think you will rapidly 

 finish the Wenlock line. But don't neglect to map 

 such sandstones as are needful. Ever sincerely, 



ANDW. C. RAMSAY. 1 



ASHBY DE LA ZOUCHE, \^th June 1855. 



MY DEAR TALBOOTS The Pembrokeshire fragments 

 [of map] will follow this by to-morrow's post. The 

 plain green [colour on the map] is intended to repre- 

 sent greenstone, and the striped green, felspathic trap. 

 In the parcel are fragments drawn by me on an 

 enlarged scale for the purpose of mapping when on 

 the ground. / know that all the traps between St. 

 David's Head and Pen-berry are intrusive greenstones, 

 and you need not visit them unless you like. I fear 

 that the trap on which St. David's stands will want 

 looking to and separation into kinds all the way from 

 east to west. I think you will find most of the long 

 strips greenstone, but I recollect that some of them 

 between Aber - pwll (four miles north - east of St. 

 David's Head) and Mathry are felspathic ash. I once 

 stayed a week at a public-house at Mathry. 



St. David's Island is mostly greenstones, but 

 some felspar ; Lower Solva and Whitchurch, felspar 

 and quartz, I think ; in fact, a granite without its mica. 

 I think Trefgarn is greenstone, but am not sure. I 

 suspect there are both kinds near St. Dogwells. At 

 Wolfe's Castle there was a public-house, where I put 



1 A melancholy interest attaches to this letter, for it intimates the last official 

 act of De la Beche's life. He had been at the Museum the day before, and 

 given the consent above referred to ; but before the letter could reach its destina- 

 tion ' our dear old governor, whose like we shall never see again,' as Ramsay 

 wrote, had passed away. 



