American Journal of Science and Arts

acid activity amount analysis angle appears average base Basin beds cent character chemical close coast complete composition considerable considered containing crystals curve deposits described determined direction effect evidence experiments faces fact fauna feet figures formation fossils Geological given gives granite greater heated important increase indicated interest iron Island known later less limestone locality lower mass material means measured metal method miles mineral natural nearly noted observed obtained occur original oxide period plates portion position possible precipitate prepared present pressure probably pyrite quartz recent regard region relations remains represented rock seed seen sericite shale shown side silver similar solution species specimens structure suggested sulphide sulphur surface Survey Table temperature thickness tion tube valley volume zone