102 



R. A. DALY ORIGIN OF THE ALKALINE ROCKS 



Table showing Field Associations of Alkaline and Suhalkaline Eruptives — Continued. 



AFRICA. 



Region. 



Kamerun, Africa. 



Niger-Benu6 area, 

 West Africa. 



Ahaggar, Central 

 Africa. 



Alkaline eruptives. 



Monzonite, kerato- 

 phyre, bostonite, 

 camptonite, voges- 

 ite, leucitite, et- 

 cetera. 



Foyaite. 



Associated suhalka- 

 line eruptives. 



Diabase, diorite, 

 etcetera. 



Carbonate rocks cut by 

 alkaline eruptives. 



Cretaceous (and old- 

 er ?) limestones. 



Phonolite. 



Air, Central Africa. 



Great Kift Valley, 

 East Africa. 



Abyssinia. 



Bushveld, 

 Africa. 



South 



Marico, Transvaal. 



Phonolite, alkal 

 ine trachyte. 



Phonolites, comend- 

 ites, trachytes, 

 kenites, nephelin- 

 ites (bearing mel- 

 ilite), borolanite, 

 nephelite basalt, 

 limburgite, tephr- 

 ite, nephelite 

 basanite, leucite 

 basanite. 



Phonolites, tingua- 

 ites, grorudite, 

 paisanite, sOlvs- 

 bergite, etcetera. 



Nephelite syenite, 

 monchi quite, 

 camptonite, bos- 

 tonite, etcetera. 



Nephelite syenites. 



Limestone of un- 

 known age. 



Basalt, granite. 



Granite, rhyolite. 



Olivine basalt. 



Silurian limestones ; 

 (Cretaceous marls 

 ? ; other lime- 

 stones?) 



? Crystalline lime- 

 stones of gneissic 

 plateau ; calcare- 

 ous sandstone, 

 conglomerate and 

 shales of Paleo- 

 zoic ? 



Olivine basalt, 

 diabase, gabbro, 

 diorite, etcetera. 



Norite, gabbro, 

 granite, etcetera. 



Norite, gabbro. 



Thick crystalline 

 limestones and do- 

 lomites in gneissic 

 plateau ; also Ju- 

 rassic and younger 

 limestones. 



The Great Dolomite. 



Ditto. 



