328 REPORT— 1897. 



Retd. 

 No. 



722 Dolerite sill, including shale . Salisbury Craigs, Edinburgh. 23 P, 

 245 Laccolite of dolerite. . . Fair Head, Antrim. 9 P. S.* 



89 „ base of, resting on Corndon, Montgomery. 1 P. 

 shales. 



88 „ „ „ ,. ,, 1 P. 



90 Laccolite, summit of, with „ „ 1 P, 



.shales resting on it and a 



small easement dyke. 

 980 Volcanic ' neck.' . . . Tieveragh Hill, Cushendall. 9 P.* 

 716 Intrusive felsite. , . . Glencorse, Edinburgh. 23 P. 



I, ,, ... „ ,, £iO Jr. 



999 Granite cutting off Ordovician Glen River, Down. 32 P. 

 Rocks which are penetrated 

 by a dyke of dolerite. 

 1601 Dolerite dyke cutting through Squire's Hill, Antrim. 33 P. 

 chalk and including patches 

 of it. 



1752 Composite dyke. . . . Glasdrumman, Newcastle, Down. 9 P.* 



1753 < 9 P * 



1754 9 P * 



Roch-structures. 



240 Columnar structure. . . Giant's Causeway. 9 P.* 



236 „ „ „ „ ' Giant's Fan.' 9 P.* 



237 „ „ „ „ ' The Honeycomb.' 9 S.* 

 239 Cup and ball structure. . . „ ,, ' Giant's Gateway.' 9 P.* 

 849 Columnar diorite in Cambrian. Atherstone. 7 P. 



441 ,, diabase. . . Welshpool. 1 P. 



1597 „ rhyolite. . . Tardree, Antrim. 33 P. 



1396 Radiating columns. . . The Spindle Rock, St. Andrews. 3 S. 



1307 Nodular porphyroid. . . High Sharpley, Charnwood. 1 P. S. 



1759 Perlitic structure. . . . Mexico. 1 P. 



1 187 Spheroidal structure. . . Ballengeich, Stirling. 34 P. 



Origin of Surface Features. 



Valleys. 



978 Denudation of Tertiary Basalt, Glenariff, Antrim. 9 P.* 

 &c. 

 1147 Denudation of Carboniferous Trow Gill, Clapliam. 3 P. 

 Limestone. 



Escarpments. 



1319 Aymestry Limestone. . . Weo (View) Edge, Salop. 29 P. 

 1435 Millstone Grit. . . The Roaches, Staffs. 22 P. S. 



1432 ''2 P 



1315 Carboniferous and igneous Wrekin, Salop. 29 P. 



rocks on Cambrian and 



Uriconian Rocks. 

 1421 Rhsetic and Lower Lias. . Sedgemoor and Polden Hills, Somerset. 22 S. 



Influence of structure planes. 



1085 Joints governing denudation. Tintagel. 3 P. 



1561 „ „ „ Hilbre Island, Cheshire. 10 P. 



1191 „ „ „ Criccieth. 25 P. S. 



and forming caves. 



1232 Bedding and joints influencing Criccieth. 25 P. S. 



formation of caves. 



1122 „ „ „ Filey. 3 P. 



1585 Dip influencing valley contours. Cheddar,-Somerset^ IIP. 



