GeoLog

Geomorphology

Imaggeo On Monday: Great Sand Dunes Sunset

November 23, 2020
Imaggeo On Monday: Great Sand Dunes Sunset
Great Sand Dunes Sunset . Credit: John Counts (distributed via imaggeo.egu.eu)

On a late afternoon in Colorado’s Great Sand Dunes, the sun came out from behind the clouds for a brief moment before it went behind the horizon, illuminating the stoss side of an eroding dune. Sand originated from lacustrine deposits in the San Luis Valley; the Sangre de Cristo mountains, which can be seen in the background, provided a source of some of the sand. This image therefore illust ...[Read More]

Travels in Geology: A World Turned Upside Down

March 27, 2020
Travels in Geology: A World Turned Upside Down
North Table Mountain in Golden, Colorado (Photo credit: Terri Cook).

Last weekend, with a strict, stay-at-home coronavirus order looming on the horizon, I decided to practice social distancing by escaping on one last hike. Since I’m currently in Colorado, I chose to climb North Table Mountain, the remnant of an ancient basalt lava flow located on the outskirts of Denver.   Locally this mesa, along with its twin located a short distance to the south, are popula ...[Read More]

Imaggeo on Mondays: The sun rises also in the middle of nowhere

February 17, 2020
Imaggeo on Mondays: The sun rises also in the middle of nowhere
Credit: Andrea Libertino (distributed via imaggeo.egu.eu)

Uluru in Australia is one of the most visibly recognisable geological features in the world. This sandstone formation covers an area of 3.3 kilometres and stands 345 metres above the plains around it. According to geoscientists, the rocks that form Uluru were deposited in an inland sea during the Cambrian Period approximately 500 million years ago. The arkose sandstones were then uplifted and fold ...[Read More]