GeoLog

Navajo Sandstone

Imaggeo on Mondays: Of ancient winds and sands

November 6, 2017
Imaggeo on Mondays: Of ancient winds and sands
Movement of ancient sand . Credit: Elizaveta Kovaleva (distributed via imaggeo.egu.eu)

Snippets of our planet’s ancient past are frozen in rocks around the world. By studying the information locked in formations across the globe, geoscientist unpick the history of Earth. Though the layers in today’s featured image may seem abstract to the untrained eye, Elizaveta Kovaleva (a researcher at the University of the Free State in South Africa) describes how they reveal the secrets of anci ...[Read More]

Imaggeo on Mondays: The place where water runs through rocks

July 13, 2015
Imaggeo on Mondays: The place where water runs through rocks
Waved rocks of Antelope slot canyon. Credit: Frederik Tack (distributed via imaggeo.egu.eu)

Antelope Canyon, located in Arizona, USA, was formed by erosion of the Navajo Sandstone, primarily due to flash flooding and secondarily due to other sub-aerial processes (think of physical weathering processes such as freeze-thaw weathering exfoliation and salt crystallisation). Rainwater runs into the extensive basin above the slot canyon sections, picking up speed and sand as it rushes into the ...[Read More]