Tag Archives: Nirgal Valles

HiRISE: Ridges near Nirgal Valles

In this observation, we see a set of straight ridges in ancient bedrock near Nirgal Valles. The patterns indicate fractures from tectonic stresses, but how have they been hardened to now stand in positive relief after billions of years of … Continue reading

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THEMIS: Channels across lava plains near Nirgal Vallis

THEMIS Image of the Day, June 22, 2017. Do you see what I do? Someone on Mars is smiling at me. (THEMIS Art #131) More THEMIS Images of the Day by geological topic.

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THEMIS: Channels of Nirgal Vallis

THEMIS Image of the Day, March 2, 2017. This VIS image shows a portion of Nirgal Vallis. A tributary of the channel is seen on the left side of the image, with the main channel crossing the image from left … Continue reading

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HiRISE: Terrain northeast of Nirgal Vallis

Terrain northeast of Nirgal Vallis. Beautiful Mars series.

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HiRISE: Gullies and bedrock in Nirgal Vallis

The gullies in this image are within the valley wall of an ancient channel — Nirgal Vallis — a testament to flowing water in Mars’ ancient past. However, the formation of gullies are still the subject of much debate with … Continue reading

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HiRISE: Possible phyllosilicates in Nirgal Vallis

Possible phyllosilicates in Nirgal Vallis. Beautiful Mars series.

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