BALANCING ACT
AH-SHI-SLE-PAH WILDERNESS, NEW MEXICO, USA
“The Ah-Shi-Sle-Pah Wilderness can feel like an alien planet, with its strange shapes, colours and lack of vegetation,” says Stan Allison, of the Bureau of Land Management Farmington Field Office. The hoodoos – irregular columns of rock – dotted around the landscape also help create that otherworldly quality.
Hoodoos are a lesson in differential erosion: the stronger sandstone resists the erosion that acts on the softer surrounding rock to create spires and precariously balanced capstones. Elsewhere, the ground is so soft that rain cuts vertical sinkholes into hills, carving mazes of ravines and gullies.
The Ah-Shi-Sle-Pah Wilderness is also home to fossilised turtles and crocodiles – a lurking reminder that the parched desert was a humid swamp only 75 million years ago.
BED OF NAILS
TSINGY DE BEMARAHA NATIONAL PARK, MADAGASCAR
This vast field of rocky spires is the spectacular remains of a lagoon from the age of the dinosaurs. The clints and grykes (patches of limestone pavement separated by cracks) are enhanced by a subterranean labyrinth of caves that collapse and deepen the grykes.
The structure began to form 200 million years ago when calcium carbonate built up on the bottom of the lagoon. It was compacted into limestone before being exposed by tectonic uplift and falling sea levels. In the millennia since then, monsoons carved out the soft rock while acidic rain etched scalloped edges along the jagged needles.
The rocks create microclimates and isolated biomes filled with a rich diversity of life, and scientists have documented endangered and unique species within the harsh landscape.
Denne historien er fra Summer 2022-utgaven av BBC Science Focus.
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Denne historien er fra Summer 2022-utgaven av BBC Science Focus.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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