Qualla: Stuart Range

Stuart Range: Introduction

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Tentotwo, CC BY-SA 3.0. In 1858, the Scottish explorer John McDouall Stuart pushed north into the centre of the continent and ran into a problem at his feet. The ground was littered with hard, flinty stones that lamed his horses and slowed his party to a crawl. Short on provisions and feed, he turned back toward the coast hundreds of kilometres to the south. Stuart never knew it, but those tormenting stones were the surface armour of one of the richest opal fields on Earth, and the low ridge he skirted would carry his name for generations: the Stuart Range.

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Image: Tentotwo | CC BY-SA 3.0

Stuart Range: The Field That Bore His Name

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Tentotwo, CC BY-SA 3.0. When opal was finally discovered in this country in 1915 - by prospectors who had come looking for gold - the diggings that sprang up took the name the explorer had left behind. For years the settlement was known simply as the Stuart Range Opal Field, before locals settled in 192...

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Image: Tentotwo | CC BY-SA 3.0

Stuart Range: A Hundred Million Years Down

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Robert Link, CC BY-SA 2.0. The Stuart Range is barely a range at all - a low upland running about 170 kilometres from north-west to south-east, passing within ten kilometres of Coober Pedy. Its real drama is in its layers. Beneath it lies the Bulldog Shale, grey marine mudstone laid down in the Early Creta...

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Image: Robert Link | CC BY-SA 2.0

Stuart Range: The Armour of the Desert

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Tentotwo, CC BY-SA 3.0. Stuart's flinty stones have a name too: silcrete, a rock-hard crust formed as dissolved silica re-cemented loose sediment into sheets near the surface. Over immense spans of time, as wind and water stripped away the softer ground, this silcrete was left behind as a scatter of gib...

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Image: Tentotwo | CC BY-SA 3.0

Stuart Range: The Great Divide

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Tentotwo, CC BY-SA 3.0. For all its modest height, the Stuart Range plays an outsized role in how water moves across this country. Through the Tertiary period it served as a major drainage divide, separating the ancient river systems of the Eucla Basin from those feeding toward Lake Eyre. Today the mult...

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Image: Tentotwo | CC BY-SA 3.0