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More model informationThis specimen comes from the Hunter Valley in NSW, Australia. The valley hosts Permian sedimentary rocks including large sequences of coal measures. Also present are a variety of younger igneous intrusions, mostly in the form of dykes and sills. Where igneous bodies intrude coal seams, some unusual interactions occur due to the reactivity of the coal. This particular example shows inclusions of sintered and partly fluidised coal (dark grey) that have been incorporated as xenoliths in a dyke of monzonitic composition (pale coloured part of the rock). The coal is now mostly graphite. While the exact age of the dyke is unknown, it is likely to be Jurassic (based on the age of other similar nearby intrusions).
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