Tag Archives: periglacial terrain

HiRISE: Mounds in depressions in Deuteronilus Mensae

Mounds in depressions in Deuteronilus Mensae. The objective of this observation is to determine the nature of round mounds in depressions. The depressions may be part of the ribbed upper plains unit. Some of the edges of the depressions are … Continue reading

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HiRISE: Quite smoooooth

Quite smoooooth. Here in Deuteronilus Mensae, there is a smooth geologic unit overlying plains material. There are also slightly convex-up edges, polygonal patterns on the surface, and softened craters. HiRISE Picture of the Day archive. [More at links]

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THEMIS: Northern Terra Sabaea in false color

THEMIS Image of the Day, March 25, 2019. This false-color VIS image shows part of northern Terra Sabaea. Blue tones in false-color images usually indicate basaltic sand. The THEMIS VIS camera contains 5 filters. The data from different filters can … Continue reading

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THEMIS: Bumpy hills of Arianes Colles

THEMIS Image of the Day, March 18, 2019. Today’s VIS image shows part of Ariadnes Colles. The term colles means hills or knobs. The hills appear brighter than the surrounding lowlands, likely due to relatively less dust cover. Ariadnes Colles … Continue reading

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HiRISE: The slow charm of brain terrain

You are staring at one of the unsolved mysteries on Mars. This surface texture of interconnected ridges and troughs, referred to as “brain terrain” is found throughout the mid-latitude regions of Mars. (This image is in Protonilus Mensae.) This bizarrely … Continue reading

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THEMIS: Acidalia Colles in false color

THEMIS Image of the Day, March 4, 2019. This VIS image shows part of Acidalia Colles. The term colles means hill. Dark blue tones in this band configuration typically identify basaltic sands. This “blue” material is found on the plains, … Continue reading

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THEMIS: Protonilus Mensae in false color

THEMIS Image of the Day, February 28, 2019. The hills in this false-color VIS image are part of Protonilus Mensae. These hills, located between the relative highlands of Terra Sabaea and the lowlands of Vastitas Borealis, most likely formed by … Continue reading

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HiRISE: Gullies and crevasses on a mesa

Gullies and crevasses on a mesa. Beautiful Mars series. [More at links]

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HiRISE: Crater in the aureole of Pavonis Mons

A crater in the aureole of Pavonis Mons. This is an unusual crater in the Pavonis Mons aureole, possibly a glacial deposit. It appears to have secondaries or textured ejecta (sign of freshness), but is mostly infilled. It also has … Continue reading

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HiRISE: Curving pits and ridges

This terrain is unusual for the South Polar region of Mars, with a set of curved ridges of unknown origin. Small pits are present, often concentrated on the ridges, that may have resulted from sublimation of ice. [More at link]

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