176 Howarih : The Icc-honic Boulders of Yorkshire. 



I. The above is a rough chissification of 2,070 boulders (above 

 a foot in diameter), noted on the Holderness coast between 

 Withernsea and Hornsea, a distance of 14 miles, during the 

 summer of 1895. 



II. All the boulders tabulated in Sections A, B, C, D, E, G, H, 

 in above table, were in situ in the clay, or were close to the 

 boulder-clay cliff from whence they were recently fallen. In 

 section F, however, a large group of boulders occurred at about 

 ' half-tide,' and these are included in the Table. 



III. Table I. gives the actual number of boulders noted in 

 the different sections of coast. Table II. gives the percentage 

 of the different classes of the rocks. 



IV. The largest boulder seen was a block of Carboniferous 

 limestone on the beach near Mappleton, 85 in. X 31 in. X 30 in. -\- 

 and many others approaching this size. 



A block of garnetiferous schist was noted at the base of cliff' 

 near Cowden, 22 in. X 30 in. X 13 in. 



Table II. 





A 



B 



C 



O 



E 



F 



G 



H 



BOULDERS 

 Over One Foot in 

 Diameter. 



Withernsea 

 to 



Sand-le-Mere 



Sand-le-Mere ] 

 to 



Tunstall. 



Tunstall 

 to 



Hilston. 



Hilston 

 to 



Thorp Garth. 



Thorp Garth 

 to 



Aldborough. 



Aldborough 

 to 



1 Mile N. 



1 Mile N. of 

 Aldborough to 

 Mappleton. 



Mappleton 

 to 



Hornsea. 



3 Miles 



1 



1 Mile. 





CO 



S 



1 Mile. 



1 



2 Miles. 



at 



Origin. 



Per Cent. 



Per Cent. 



1 



Per Cent. 



Per Cent. 



Per Cent. 



Per Cent. 



Per Cent. 



Per Cent. 



Carboniferous Limestone, 

 including possibly a 1 

 few other Palaeozoic f 

 Sedimentary Rocks. j 



46-1 



37-6 



16-7 



253 



23-8 



23-9 



19-4 



24 



Sandstones, Grits, etc,'! 

 probably all from Car- 1 

 boniferous or other j 

 Palaeozoic Rocks. j 



14 6 



17-9 



13-2 



13-7 



71 



10-3 



17-7 



20-9 



Mesozoic Pvocks. Jurassic ^ 

 Limestones and Sand- J- 

 stones, Chalk, etc. j 



11 



18-6 



45-8 



28-4 



34-6 



27-6 



49-4 



36 



Basaltic and other Erup- ) 

 tive Rocks. [ 



19-5 



23 4 



21-.5 



26-4 



30-8 



34-6 



12-4 



16 



Granite, Schist, Gneiss, etc. 



8 5 



2-5 



2-8 



5-2 



3-7 



36 



1-1 



3-1 





100-0 



100-0 



100-0 



100 0 



100 0 



100 0 



100-0 



100-1 



Naturalist, 



