Diabase
Videos
Diabase, also called dolerite or microgabbro, is a mafic, holocrystalline, subvolcanic rock chemically equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow i
Diabase
Fair Head, Northern Ireland, a sill of dolerite
A diabase dike crosscutting horizontal limestone beds in Arizona
Diabase boulders at Devil's Den on the Gettysburg Battlefield, Pennsylvania, US
Tasmania
Videos
Tasmania is an island state of Australia. It is located 240 kilometres to the south of the Australian mainland, and is separated from it by the Bass Strait. The state encompasses the main island of Ta
Diabase
…of South Africa, the Ferrar Dolerites of Antarctica, and the largest of these, the most extensive of all dolerite formations worldwide, are found in Tasmania. Here, the volume of magma which intruded into a thin veneer of Permian and Triassic rocks from multiple feeder sites, over a period of perhaps a million…
Tasmania from space
Tessellated pavement, a rare rock formation on the Tasman Peninsula
1807 engraving by French explorer Charles Alexandre Lesueur shows seafaring Aboriginal people and a large canoe on the eastern shore of Schouten Island.
Tasmania is named after Dutch explorer Abel Tasman, the first European to sight the island, in 1642.