Impactite Name: DARWIN GLASS
natural glass melt created by meteorite impact
Location: in Wild Rivers National Park, World Heritage Area,
26 km south of Queenstown, Tasmania
Country: AUSTRALIA
Date: Find: 1915
The
huge Darwin Crater, approx. 1 km across and 200 m deep, was
created about 73,000 years ago when a meteorite struck Tasmania
near Mt. Darwin. The heat generated by the explosive force of
the impact melted and vaporized the rocks. The molten material
was hurled into the sky, falling back as glass and creating
one of the world's most spectacular silica glassfields associated
with a meteorite crater.
The
geologist Lostus Hill found in 1915 small pieces of impactite
glass about 10 km west of the crater, but could not pinpoint
the source of it. In 1972 R.J. Ford, a geologist at the University
of Tasmania, found the crater in dense bush whilst working on
an access road for the then proposed Gordon-below-Franklin Dam
for the Hydro-Electric-Commission. The crater floor is covered
by thick tea-tree swamp. In 1974 a 4WD track was bulldozed into
the crater to allow a drill hole being put down in the centre.
This showed that in the past 73,000 years the crater has completely
been filled with sediment, which provides a valuable pollen
record revealing the changing vegetation of the area.
To
visit this unusual site today please be reminded that it is
now protected within the World Heritage area, and any samples
are not allowed to be taken away! But it is still worth wile,
seeing the Darwin Glass in situ.
If
you have got a piece of Darwin Glass consider yourself very
lucky, as there is no more material coming out from the crater
area anymore these days!

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