Qualla: Bosques Petrificados de Jaramillo National Park

Bosques Petrificados de Jaramillo National Park: Introduction

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Eassi, CC BY 3.0. Run your hand along one of the fallen trunks and you expect bark. Instead you feel cold stone, polished hard, the growth rings preserved in agate and jasper as cleanly as the day the tree died. There are no living trees for miles here, only low spiny scrub bending in the wind of the Santa Cruz steppe. Yet these trunks are unmistakably trees, some two meters across, some thirty meters long, lying where they fell roughly 150 million years ago. The Jaramillo Petrified Forest holds the remains of one of the planet's great lost woodlands, frozen mid-collapse and waiting on the open plain for anyone willing to make the drive.

Image: Eassi | CC BY 3.0

Bosques Petrificados de Jaramillo National Park: A Forest Before the Mountains

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Ghedoghedo, CC BY-SA 3.0. To understand this place, subtract the Andes. In the late Jurassic, the mountain wall that now blocks Patagonia's rain had not yet risen. Moist air rolled in freely from the Pacific, and Santa Cruz was warm, wet, and dense with forest. Towering conifers grew here, chief among the...

Image: Ghedoghedo | CC BY-SA 3.0

Bosques Petrificados de Jaramillo National Park: How Wood Becomes Stone

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Cristian imagine, CC BY-SA 4.0. Petrifaction is a slow act of substitution. Volcanic ash sealed the trunks away from the oxygen that would have rotted them. Mineral-rich groundwater seeped in, and molecule by molecule, silica replaced the woody tissue while keeping its structure intact. What remains is not wood...

Image: Cristian imagine | CC BY-SA 4.0

Bosques Petrificados de Jaramillo National Park: Life on the Steppe Today

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit [][-_-] JORGE], CC BY 2.0. The living landscape could hardly contrast more sharply with the one entombed beneath it. This is Patagonian steppe: cold, arid, and relentlessly windy, with barely 200 millimeters of rain a year and temperature swings from summer highs near 40 degrees Celsius to hard winter fros...

Image: [][-_-] JORGE] | CC BY 2.0

Bosques Petrificados de Jaramillo National Park: Protecting the Deep Past

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Eassi, CC BY 3.0. Argentina first guarded the trunks in 1954, designating roughly 13,700 hectares as the Petrified Forest Natural Monument. That status held for decades until the National Parks Administration acquired adjacent land and, in December 2012, reclassified the expanded area as a full na...

Image: Eassi | CC BY 3.0