ON PHOTOGRAPHS OF GEOLOGICAL INTEREST 545 



Caverns and Springs. 

 Kegd. 



No. 

 1804( Icicles showing line of springs . Entrance to Severn Tunnel, Monmouth, 



41 P. 



Wind Action. 

 460 Blown Sand, stratified . . Leasowe, Cheshire. 10 S. 



Action of Rain. 

 2 Earth Pillars .... Botzen, Tyrol. 34 S. 



w ,, ,, .... 1) 11 «^4 o. 



Glaciation ; Glaciated Surfaces. 

 1906 Strias on Granite . . . Wasdale Crag, Westmoreland. 3 P.* 



Glaciation ; Erratic and Perched Blocks. 

 1842 Glaciated Boulder (Limestone) . Doncaster. 1 P. S. 



Glaciation ; Boulder Clays. 

 1856 Boulder Clay .... Kailway, S. of Harlech. 1 P. S. 



Volcanic and Plutonic Rocks. 



Roch^nasses and their Relations. 



1286 Agglomerate (Precambrian) . Hanging Stone, Cliarnwood, Leicester. 



1 S. 

 603 Granitite intrusive in Tremadoc Foel Tan-j--Grisiau, Carnarvon. 31 S. 



rocks. 

 827 Intrusive masses in Ordovician Yr Eifl, Nevin, Carnarvon. 25 S. 



rocks. 

 1909 Whin Sill in Carboniferous Lime- High Cup Nick, near Appleby. 8 P.* 

 stone. 



Rocks and their Structures. 



1800 Columnar Microgranite . . Ailsa Craig. 15 P. 



1801 „ „ . . „ 15 P. 

 1849 Spheroidal Basalt . . . Northumberland. 1 P. 



1847 Amygdaloidal Basalt . . . Squire's Hill, Antrim. 1 P. 



1848 Flow-structure in Rhyolite . . Tardree, Antrim. 1 P. 

 1859 Porphyritic Pitchstone . . Arran. 1 P. 



1853 Ophitic Olivine-dolerite . . Gortacloghan, Londonderry. 1 P. 

 1851 TufiE (Carboniferous) . . . Phillipstown, Queen's County. 1 P. 



Characteristic Rocks and Landscapes. 



Palceozoic. 



857 Carboniferous Limestone . . Burrington Combe, Mendip Hills. 2 P. 



550 „ „ . . Eglwyseg Rocks, near Llangollen, Den- 



bigh. 51 P. 



551 „ „ . . Tynant Ravine, near Llangollen. 51 P. 



00« „ ,, . . ,, ,, 51 r, 



551a „ „ . . Bron-heulog Quarry „ 51 P. 



163 Magnesian Limestone . . . Garforth, Yorkshire. 5 P. 



1916 Lower Brockram Escarpment of Near Holf, Appleby. 3 P.* 

 Permian. 



Mesozoic. 



1922 St. Bee's Sandstone (Trias) . Hilton Quarry, Applebj'. 3 P.* 

 1595 Unconformity of Chalk on Trias Murlough Bay, Antrim. 50, 9 P.* 

 1898. N N 



