298 
1 
Appendix B. 
a list or boulders from the basement boulder clay at 
bridlington quay.''' 
Note,— The Boulders vary in size from pebbles to blocks of several feet 
in diameter. c. common, r. rare. 
Igneous Rocks. f 
c. Granite of several distinct types, generally pink, gray, or dark- 
coloured. 
Biotite-granite, 
Hornblende-granite, and 
Syenite of several kinds, including 
Augite-syenite. 
Andesite. 
c. Porphyritic felstone, 
Felsite, and 
Quartz-Felsite. 
c. Porphyrites of various kinds. 
c. Basalts in great variety, including 
Olivine-basalt, 
Amygdaloidal -basalt, 
Dolerite, 
Diabase, and 
Diorite. 
r, Volcanic Ash, Tulf, and 
Breccia. 
Metamorphic Rocks. 
Mica-schist of various kinds, including 
r. Garnetiferous Mica- schist. 
Hornblende-schist and-gneiss. 
c. Gneiss of various kinds. 
* See also C. Reid's " Holderness," p. IB. 
f For full information respecting some of these rocks see Mr. Harker's 
descriptions in Appendix C. 
