Yorkshire Boulder Committee : Thirteenth Year's Work. 359 



Peak Station. 650 O.D. 



In gravel : gneiss, porphyrite, granite, basalt, ophitic dolerite, 

 flint (some black), magnesian limestone (resembling- that near 

 Sunderland), vein quartz, quartzite, sandstone (? sparagmite), 

 blue-green felspathic grit, Triassic sandstone, millstone grit 

 (two specimens), quartz-porphyry (PElfdalen), jasper, hornblende- 

 schist, andesite. No carboniferous limestone or lias observed. 



Peak, on moor near Green Dyke. 825 O.D. 



Quartz-porphyry, porphyrite, granite, basalt, flint. 



Danby, near Doubting Castle. 725 O.D. 

 Porphyrite, granite, flint, basalt. 



Seavy Slack, Eastington High Moor. 700 O.D. 

 Gneiss, rhomb-porphyry. 



Ainthorpe, near Danby, in field north of School-house. 

 500 O.D. 



Porphyrite, Lake District volcanic ash. 



Great Ayton, Rye Hill Gravel Pit. 425 O.D. 



Porphyrite, very abundant and greatly preponderating; over 

 all other non-sedimentary rocks tog-ether. Millstone grit (rare), 

 carboniferous limestone and chert (very rare), Lower and Middle 

 Lias, Triassic sandstone, Jurassic grit, magnesian limestone, 

 flints (both black and brown). 



Scugdale, Sparrow Hall. 600 O.D. 



Grit, carboniferous chert (one specimen), granite, green 

 Volcanic ash, porphyrite. 



On Moor, near Harfa Bank Slack. 875 O.D. 

 One carboniferous chert with cfinoid stems. 



Swainby, Scarth Nick. 625 O.D. 



Man}- large blocks of basalt and Lake District andesite, 

 pebbles of porphyrite. 



$tanghow Ridge, near Smithy. 075 O.D. 



Shap granite. 

 Lock wood Hills. 850 O.D. 



Near peat-holes gravel composed largely (at least one-third) 

 of porphyrite. 



HUTTON, NEAR GuiSBOROUGH— COD HlLL FARM. 8oO O.D. 



Porphyrite. 

 1900 December i. 



