Lightning Ridge is a town in north-western New South Wales, Australia, in Walgett Shire, near the southern border of Queensland, about six kilometres east of the Castlereagh Highway, and is served in commercial activities by the town of Walgett - some 75 km to the south.
On release, Speck worked as an opal cutter at Lightning Ridge, before moving to Sydney and establishing a successful career as an opal merchant.
Set in the opal mining community of Lightning Ridge in New South Wales it tells of the eponymous Pobby and Dingan, imaginary friends of Kellyanne Williamson, sister of Ashmol and daughter of an opal miner.
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The holotype and only known specimen, BMNH R3718, consists of a single left hand bone, discovered around 1905 near Wollaston, on the Lightning Ridge.