🪨 Khao Hua Muak: Sandstone Capstone of the Phu Kradung Formation
Nestled in Ban Na District, Nakhon Nayok, Khao Hua Muak stands as a scenic geological outcrop topped by a distinctive “stone hat” formation. Geologically, it is part of the Phu Kradung Formation, a Late Jurassic to Early Cretaceous unit composed mainly of reddish to purple sandstone, interbedded with siltstone and claystone. This formation, part of the Khorat Group, was deposited in fluvial and lacustrine (river and lake) environments and is known for producing steep cliffs, mesas, and pedestal-like towers due to differential erosion.

Campylobacter jejuni, shown here, is a microaerophilic organism requiring reduced levels of oxygen. C. jejuni is the bacterium which causes gastroenteritis. Henrik Sorensen/The Image Bank/Getty Images

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