REPORTS of the progress of the Geological Surveys in India and Canada have already been noticed in NATURE. The report of our home survey has since been issued by the Director-General, Sir ...

The United States Geological Survey, which published the Apollo maps, has since published maps of at least parts of every other rocky planet and several smaller rocky or icy bodies. In Europe ...

II. SCOTLAND. Lewisian Gneiss.—The most ancient rocks in the British Islands, forming what is known as the Lewisian Gneiss, have now been mapped continuously throughout the whole of their extent ...