Lava Creek Tuff
- Lava Creek Tuff
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Falaise de Tuf montrant la formation géologique de Lava Creek Tuff.
Lava Creek Tuff est une formation géologique[1] faite de tufs qui apparut lorsque la caldeira de Yellowstone entra en éruption il y a environ 640.000 ans d'ici.
La formation est positionnée selon un cercle autour de la caldeira et est composée de 1.000 km³ de poussières pyroclastiques[2].
Le Tuf[3] a ensuite subi une érosion au niveau du cours de la rivière Gibbon. Les couleurs des débris volcaniques varient du gris léger au rouge pâle. Les couches ont une épaisseur variant de 180 à 200 mètres[4].
Références en anglais
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