Additional photos of the Monaro Volcanic Province, New South Wales, Australia

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 hyaloclastite. 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.