Additional photos of the Monaro Volcanic Province, New South Wales, Australia
The Brothers, volcanic plugs as seen from Hudson Peak. All photographs by
Ian Roach except
Two volcanic plugs at Avonlake.
View north from Bungee Peak. Photograph by M.C. Brown.
Mount Cooper, an isolated hill made of a stack of lava flows.
Lava terraces of the Monaro Volcanic Province. Photograph by K.G. McQueen.
A road cut between Bombala and Cathcart reveals layers of hyaloclastite
(base), lake sediments
(light middle layer), and pillow basalt.
A piece of older lake sediment torn and deposited with the hyaloclastite.
The sediment was baked
by the heat of the hyaloclastite. The surface of the piece of sediment was
pitted by the hyaloclastite
shards, indicating the lake sediment was soft when the eruption formed the
Photograph by M.C. Brown.
Ankaramite from Gourock.
Travertine terrace at Rock Flat Creek. Travertine is a type of limestone
that forms by precipitation
from spring water. Water no loner flows across the terrace but is bottled
and sold as mineral water
in Canberra. Carbon dioxide gas is released by the spring. The isotope
chemistry of the carbon
dioxide indicates it originates in the mantle.