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The Flatirons

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The Flatirons are rock formations in the western United States, near Boulder, Colorado. There are five large, numbered Flatirons ranging from north to south. The Flatirons consist of conglomeratic sandstone of the Fountain Formation. Geologists estimate the age of these rocks as 290 to 296 million years; they were lifted and tilted into their present orientation between 35 and 80 million years ago, during the Laramide Orogeny. The Flatirons were subsequently exposed by erosion.
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Merci Geodog74 pour le puzzle de belles montagnes et le partage du TB.
France - Limousin - Haute Vienne

thanks

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