Qualla: Lawn Hill crater

Lawn Hill crater: Introduction

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Public domain. For a long time, nobody could explain the ring. Eighteen kilometres across, a near-perfect circle of low dolomite hills sits in the outback of north-western Queensland, north of Mount Isa, and for decades geologists argued about how it got there. The answer came in 1987, written in the rocks themselves: shatter cones and shocked quartz, the unmistakable fingerprints of a meteorite impact. Something fell out of the sky here and hit the ground with such violence that it bent and shattered solid stone. Then time buried the wound and slowly carved it back open.

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Lawn Hill crater: Reading the Fingerprints

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Public domain. Impact structures hide in plain sight. From the ground, the Lawn Hill ring looks like ordinary hill country, and that ambiguity fuelled a long debate about its origin. What settled it was evidence that can only form under the instantaneous, world-bending pressures of a hyperveloc...

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Lawn Hill crater: When Australia Lay Underwater

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Public domain. Pinning down the date took longer than confirming the cause. The structure cuts through dolomite of Cambrian age, and early on it was unclear whether the rock was deposited after the crater formed or deformed by the blast itself. More recent argon-isotope dating of impact-melted ...

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Lawn Hill crater: Preserved by Being Buried

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Public domain. There is an irony at the heart of Lawn Hill: it survives precisely because it was covered up. After the impact, the Georgina Basin kept depositing sediment, sealing the crater under younger layers of rock. Protected from the weather, the shattered structure waited out hundreds of...

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Lawn Hill crater: A Window for Life

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Public domain. A crater is more than a hole. Researchers have studied the Lawn Hill structure as a natural laboratory for how impacts reshape the environments around them - fracturing rock, opening pathways for water, and creating sheltered microenvironments where life can take hold. The inner ...

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