rfo 



INDKX 



ticial deposits, study of, 16 

 e-geology, 194 

 200 

 v ing. methods of geological, 



103 



land, unconformability in, 



121 



Syenite, a compound rock, 62 



Synclinr. 147 



Talc, 219, 232 



as a colouring ingredient of 



rocks, 70 

 soapy feel of, 73 

 Terrestrial movements, 86 



iry periods, climates of, 82 

 volcanic rocks of Britain, 163 



; re of rocks, 59 

 Thin sections of rocks, 237 

 Thrust-plane 

 Time, as measured by unconform- 



> !. 126 



Titanifcrous iron, 247, 251 



Topaz, 219 



Topography, effect of incorrect, 

 on geological maps, 37 



Tourmaline, 230 



Trachyte, a compound rock, 62 

 rough feel of, 73 



Travelled stones, 201 



Traverses, preliminary, in field- 

 geology, 42 



Trees, dependence of, on soil and 

 rocks, 97 



Triangulation, in field-geology, 39 



Triclinic felspars, 229 



Tuffs, volcanic, 66, 158, 165, 169, 



1 20 

 deceptive resemblances to 



54 

 United States, Geological N. 



o. 49. 51 



Upheaval and depress* indi- 

 cated by fossils, 87 

 Uralite, 232 



Valleys, old buried, 207 



(igneous), 160, 163 

 (mineral). 189 

 iiies, 191 



62, 170 

 :iitc. 234 



blue colour of. 71 

 Volcanic eruptions, proofs of age 



of, 168, 169 

 funnels, 160, 165, 174 

 rocks, 158, 159, 160, 1 68 



229 



. 220 



Waves, effects of, 203 

 Weathering, effects of, 56, 68, 



156, 219, 222 

 importance of, in the search for 



fossils, 80 



\Yhite, as a colour of rocks, 68 

 " White rock " or " \\hit: b 



164 



Worm-burrows and trails, 84 

 Worms. Sec Earth-worms 



Yellow, as a colour of rocks, 69 



Zeolites. 231 



Zirkel, Prof., cited, 250 note 



THE END 



Prinltdhy R. & R. CLAKK, LIMITED, Edinburgh 



