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THE YORKSHIRE BOULDER COMMITTEE 

 AND ITS THIRTEENTH YEAR'S WORK, 1898-9. 



PERCY F. KENDALL, F.G.S., Chairman. 



AND 



J. H. HOWARTH, F.G.S., Hon. Secretary. 



The records during- the year relate chiefly to the eastern side of 

 the county, and we have ag'ain to gratefully acknowledge the 

 continued interest shown by the members of the Boulder Com- 

 mittee of the Hull Geological Society. 



The Chairman (Mr. Kendall) has been devoting- a g-ood deal 

 of attention to North-East Yorkshire, and he and Mr. Muff 

 have made some interesting records and observations. 



The principal point to be noted in the reports is the extended 

 area over which Scandinavian rocks are distributed inland from 

 our east coast. The now well-known rhomb-porphyry has been 

 found at Brantinghamthorpe by Mr. Crofts ; at Brigham Hill, 

 near North Frodingham, by Mr. Walton ; at Yedmandale by 

 Mr. Sheppard ; and at Elloughton, near Brough, by Mr. Stather. 

 There is, further, remarkable testimony to its presence at high 

 levels. At several points exceeding 600 feet Ordnance datum it 

 has been found by Messrs. Kendall and Muff on the Cleveland 

 Hills, and by Mr. Stather at 810 feet Ordnance datum on Wesl 

 Rigg, in the Lockwood Hills, embedded in boulder clay. The 

 note appended to Mr. Stather's records should be specially 

 mentioned, showing that the pink flints common in the boulder 

 clays of Holderness, and believed hitherto to be from Denmark, 

 are unknown there. 



On the Cleveland Hills some interesting- facts are reported 

 by Mr. Kendall, who says that he and Mr. Muff have found that 

 at high altitudes there is a significant absence of the rocks 

 which belong to the Teesdale dispersion, such as Snap granite, 

 brockram, and whin sill, while all carboniferous rocks are 

 exceedingly rare. On the other hand magnesian limestone of 

 a type which appears to be restricted to the coast of Durham is 

 very abundant in association with a profusion of porphyrites 

 from the Cheviots, and occasional flints, Scandinavian rocks, 

 and shell fragments. 



On the west side of the county Messrs. Law, Burton, and 

 others have continued a vigilant outlook in the Calder Valley 

 and adjacent districts w ithout, however, finding anything new . 

 1900 December i. 



