...ancient volcanic rocks of the island, composed of slaty diabase, phonolite, and trachyte. Over the marine lavas and tuffs trachytic and basaltic products...4000 and 5000 feet in thickness, have been piled, the central parts of the Grand Canary reaching the height^ of about 6000 feet above the level of the...

...ancient volcanic rocks of the island, composed of slaty diabase, phonolite, and trachyte. Over the marine lavas and tuffs trachytic and basaltic products...4000 and 5000 feet in thickness, have been piled, the central parts of the Grand Canary reaching the heights of about 6000 feet above the level of the...

...ancient volcanic rocks of the island, composed of slaty diabase, phonolite, and trachyte. Over the marine lavas and tuffs trachytic and basaltic products of subaerial volcanic origin, between 4,000 and 5,000 feet in thickness, have been piled, the central parts of the Grand Canary reaching...

...phonolite, and trachyte. Over the marine lavas and tuffs trachytic and basaltic products of subatirial volcanic origin, between 4000 and 5000 feet in thickness, have been piled, the central parts of the Grand Canary reaching the height of about 6000 feet above the level of the...

...ancient volcanic rocks of the island, composed of slaty diabase, phonolite, and trachyte. Over the marine lavas and tuffs trachytic and basaltic products...4000 and 5000 feet in thickness, have been piled, the central parts of the Grand Canary reaching the height of about 6000 feet above the •level of...

...shells, appear to be about the same age as the most ancient volcanic rocks of the island. Over the marine lavas and tuffs trachytic and basaltic products of subaerial volcanic origin, between 4,000 and 5,000 feet in thickness, have been piled, the central parts of the Grand Canary reaching...