The Tasmanian dolerites were intruded into
essentially flat-lying Permian and Triassic sediments
in the form of sheets, commonly exceeding 1000 feet
in thickness, large dyke-like intrusions up to one
mile in width, and transgressive bodies. The dolerite
is post Triassic and pre-Tertiary in age, and Hills
and Carey (194-9, 54-) and Banks (1958, 234-) suggest
that the intrusions took place in the Jurassic.
They crop out over more than 6,000 square miles, and
Edwards (1942, 452) has...[Show more]
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