39 



LINCOLNSHIRE COAST BOULDERS. 



F. :SL BURTON, F.L.S., F.G.S., 



Ga{nsboron,^h. 



While on the Lincolnshire coast at Sutton-on-Sea in Jul}- last 

 I collected such boulders as appeared to me at the time to differ 

 from those I had found before (an account of which is given in 

 'The Naturalist' for 1898, p. 133), and sent them up, 17 in 

 number, to Mr. T. Sheppard, F.G.S., Curator of the Municipal 

 ^luseum, Hull, who has kindly named them and had them veri- 

 fied by Mr. Percy F. Kendall, F.G.S. The numbers of those sent 

 up — 21 to 37 — are carried on from the numbers in the former list, 

 to which they form a sequence, and the following is the descrip- 

 tion given : — 



23, 29. A Porphyry of quite a distinct and characteristic type, found in 

 the Boulder Clay of East Yorkshire. Probably Scandinavian, 

 thoug-h a rock very similar occurs near Peterhead. This 

 question, ho\ve\"er, is at present under consideration. 



26, 37. Trachytes, from the Southern Uplands (Scotland). 



21. Typical Rhomb-porphyry, from Christiania. 



22. Dalecarlia (?) Porphyrite (Scandinavian). 



32. Apparentlv a finer variety of No. 22. 



30, 28. Probably from same source as Xos. 26 and 37. 



34. Weathered Cheviot Porphyrite. ^ 



24. Ang-en-g-neiss, probably Scotch. 



33. Uncertain, very like a variety of Xo. 34. 



31. Amygdaloidal Basalt. May be from anyivhere. 

 27. Gneiss, probably from the Southern Uplands. 

 36. Hornblende-schist, also probably Scotch. 



25. Granite, of doubtful origin. 



35. Too weathered for definite opinion. 



Of these examples several are new to the district, and are 

 of considerable interest ; while others, though they may vary 

 a little in character, are similar in substance to those in the 

 previous list. 



Nos. 23 and 29 are the same as No. 5 in the former list. 



Nos. 26 and 37 — Trachytes — not sent before, though frequent 

 on the Lincolnshire coast. 



No. 21 — typical Rhomb-porphyry ^ — Rhoinben-porphyr of 

 Brogger. This is the first example I have met with in this 

 district, and it is remarkable that on the following day another 

 piece was found on the shore by Mr. H. Preston, F.G.S. This 



1904 February- i. 



