Photographer's Note

Certainement pas la plus belle des mes photos, mais je trouve qu’elle est très intéressante du point de vue géologique, car c’est une bien curieuse montagne formée d’immenses cailloux.

Regarder dans le WS une explication de cette étrange formation.

Du point de vue photo, ça na pas était facile trouver l’exposition juste, n’oublions pas que la montagne est noire, et le ciel claire ! Mais je trouvé le résultat correct.

Certainly not one of my most beautiful shots but I find it geologically interesting as it’s a curious mountain formed of huge rocks. You’ll find an explanation of this strange formation in the WS.

From a photographic point of view, it was not easy finding the right exposure, the mountain being black and the sky being bright. But the result seems correct.

This enormous heap of boulders is not a result of
a volcanic eruption, but has accumulated during
the weathering and decomposition of a body of
granite rock known as the Trevethan Granite.
The granite was originally intruded as a molten
mass deep below the surface, where it solidified
about 240 million years ago in Permian times.
Erosion gradually removed the rocks above and
exposed the top of the granite body. This was
sparsely fractured, and weathering and
decomposition could advance further only down
these few weaknesses, to leave large rectangular
corestones in between.
Once isolated by removal of the weathering
debris, the corestones suffered little further
deterioration, apart from rounding of their corners.
As erosion and lowering of the surrounding land
surface proceeded over millions of years, more
and more corestones were left piled up over the
granite mass.
Other smaller boulder mountains are known in
north Queensland and appear to be a feature of
humid tropical climates. The black colour is only a
coating of lichens and inside the granite is pinkish
Geological Society of Australia Inc (Qld Division)

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Additional Photos by Toni Alvarez (toni_al) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1302 W: 106 N: 1428] (15875)
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