Tag Archives: periglacial processes

THEMIS: Rough ground in Nilosyrtis

THEMIS Image of the Day, June 11, 2019. Today’s VIS image is located on the margin of the Terra Sabaea highlands and the Nilosyrtis Mensae lowlands. The drop off is very steep – about 18,000 ft. This “edge” circles the … Continue reading

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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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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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The banded terrain on Mars

Planetary Geomorphology Image of the Month, March 1, 2019: Hannes Bernhardt (Arizona State University). An article on the banded terrain cannot be commenced by a traditional definition, as it appears to be a truly singular occurrence in the Solar System. … Continue reading

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HiRISE: Crater immediately east of Biblis Patera

A crater immediately to the east of Biblis Patera. Some questions include: (a) what is the “deposit” on the west side of the crater, seeming to cover the wall/floor interface? (b) what is the floor material; did lava come up … 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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THEMIS: Sinuous features hint at ground ice

THEMIS Image of the Day, November 8, 2018. This VIS image is located in an unnamed crater in Noachis Terra. The sinuous feature near the bottom of the crater rim appears to have been caused by down slope movement of … 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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