Similar granitic intrusions occurred in New South Wales and Queensland, and built up a mountain chain, which ran north and south across the continent; its worn-down stumps now form the east Australian highlands.
The island is mountainous in the main, almost continuously so, indeed, along the east coast, and very largely granitic, with a number of lofty upland plains in the east, and volcanic in the west.
East of the railway from Chilivani to Oristano, on the other hand, the granitic mountains continue.
Mount Ascutney, one of the Granitic Mountains, rises abruptly from the floor of the Connecticut Valley to a height of 33 20 ft.
The line separating the Hudson-Champlain basin from the Connecticut basin runs among the Granitic Mountains; and extending 25 m.