Geological Observations on Volcanic Islands
by Charles Darwin
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Geological Observations on Volcanic Islands Summary
| Geological observations on volcanic islands made during Darwin's journey to the Galapagos islands in 1831-1836. |
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| The overlying basaltic lava is in some parts extremely vesicular, in others little so; it is of a black colour, but sometimes contains crystals of glassy feldspar, and seldom much olivine. These streams appear to have possessed singularly little fluidity; their side walls and lower ends being very steep, and even as much as between twenty and thirty feet in height. Their surface is extraordinarily rugged, and from a short distance appears as if studded with small craters. |
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| Geological observations on volcanic islands made during Darwin's journey to the Galapagos islands in 1831-1836. |
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