During the Tertiary period the great volcanoes of the Andes were formed, and there were smaller eruptions in the Sierras.
In France, as in Great Britain, volcanic eruptions occurred during several of the Palaeozoic periods, but during the Mesozoic era the // /
The first eruptions piled up huge domes of lavas rich in soda, including the geburite-dacites and sOlvsbergites of Mount Macedon in Victoria, and the kenyte and tephrite domes of Dunedin, in New Zealand.
Several eruptions are recorded in Roman times.
The most remarkable feature in the geology of Elba is the extent of the granitic and ophiolitic eruptions of the Tertiary period.
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