Qualla: Iturralde Crater

Iturralde Crater: Introduction

Mon, 23 Mar 2026 00:00:00 GMT

Photo credit Public domain. Nobody noticed it from the ground. For millennia, an almost perfectly circular depression eight kilometers across sat hidden beneath the canopy of the Bolivian Amazon, invisible to anyone standing inside it. Then, in 1985, a Landsat satellite passed overhead, and the circle leapt out of the imagery like a bullseye painted on the forest floor. The Iturralde Crater, also called the Araona Crater, sits in one of the most remote corners of Madidi National Park in Bolivia's La Paz Department. Getting there requires days of river travel. Understanding what created it has taken decades, and the answer may involve one of the most violent events in the Western Hemisphere's recent geological past.

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Iturralde Crater: Spotted from Space

Mon, 23 Mar 2026 00:00:00 GMT

Photo credit Public domain. The structure was first identified from Landsat satellite imagery in 1985. Its near-perfect circularity immediately drew attention: natural geological processes rarely produce such symmetry. Located in the Abel Iturralde Province, the crater sits in an area of active river sedime...

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Iturralde Crater: Millions of Glass Beads

Mon, 23 Mar 2026 00:00:00 GMT

Photo credit Public domain. The breakthrough came from laboratory analysis of soil samples collected during a 2002 expedition. Researchers discovered tiny clusters of glass beads, millions of them per kilogram of soil, at specific depths. About 90 percent of these beads are rich in aluminum, silicon, calciu...

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Iturralde Crater: The Air Burst Hypothesis

Mon, 23 Mar 2026 00:00:00 GMT

Photo credit Public domain. The leading explanation is an air burst: a meteorite or comet fragment that entered the atmosphere at roughly 20 kilometers per second but never reached the ground intact. If the object was porous enough, composed of ice or loosely consolidated stone, the atmosphere would have to...

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Image: Public domain

Iturralde Crater: Still Waiting for Proof

Mon, 23 Mar 2026 00:00:00 GMT

Photo credit Public domain. Despite the compelling evidence, the Iturralde structure remains on the list of possible, rather than confirmed, impact sites. The remoteness of the location makes every expedition a major logistical undertaking, and the tropical environment degrades evidence quickly. Thick veget...

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Image: Public domain