ON THE ERRATIC BLOCKS OF ENGLAND, WALES, AND IRELAND. 435 



I. The above is a rough classification 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. AH the boulders tabulated in sections A, B, C, D, E, G, H in 

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

 cliff from which they were recently fallen. In section F, however, a 

 large group of boulders occurred at about ' half-tide,' and these are in- 

 cluded 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 inches x 31 inches x 30 inches +). 

 Many others approach this size. 



A block of garnetiferous schist was noted at base of cliff near Cowden, 

 22 inches x 30 inches x 13 inches. 



SOUTH WALES. 



Glamoeganshire. 

 Communicated by the Cardiff Society of Naturalists. 



Reported by Mr. J. Storrie. 

 Pencoed, Bridgend — 



Fragments of indeterminable marine shells ; chert from Lias and Carboniferous 

 limestone ; no chalk flints : 4 or 5 Lower Lias limestone with Gryphma 

 ineurva ; 3 white cherty sandstone from U. Trias of St. Mary Hill ; 7 or 8 

 Rhaetic sandstones, with fossils from St. Mary Hill ; 2 or 3 dolomitic 

 breccia ; Pennant Grit ; Cockshot rock ; over 100 Millstone Grit ; 40 to 50 

 Carboniferous limestone ; 35 Old Red sandstone, besides pebbles ; 1 black 

 micaceous flag (probably Llandeilo) ; 7 grits and yellow sandstones (pro- 

 bably Silurian) ; 1 fossiliferous Wenlock limestone ; 2 grasiites (specimens 

 mislaid) ; 3 'trap ' ; 1 brecciated 'trap ' ; 3 basalts ; 1 porphyiitic diabase 

 (amygdaloidal) ; 1 volcanic ash ; 1 rhyolite, showing macroscopic flow 

 structure ; 1 gabbro ; 1 green rock with white chalcedony. 



Some of these have been sectioned and submitted to petrologists, who note 

 the following facts : — 



One was identified with the gabbro of St. David's Head ; a felsite bore some 

 resemblance to the pre-Cambrian rocks of Pembrokeshire; 2 or 3 acid 

 rocks, brecciated felsites, and tuffs were very like Carnarvonshire rocks, 

 especially those of the Lleyn promontory. None was recognised as 

 belonging to the volcanic rocks of the neighbourhood of Fishguard, of 

 Mid Wales, or of any place further north than Carnarvonshire. 



From these data it is concluded that the movement of transport was from 

 the west or north-west. 



Some were of such a general character that it was impossible to locate them. 



IRELAND. 



Co. Down. 



Communicated by the Belfast Naturalists' Field Club. 



Coast road bettveen Ballymartin and Annalong — 



1 Granite from Slievh Lawagan, Mourne Monntaias. 



r p 2 



