{{Short description|Martian valley}}'''Tyras Vallis''' is an ancient river valley in the [[Lunae Palus quadrangle]] of Mars. It is located at 8.4 N° and 50.2° W. It was named after a classical name for the present [[Dniester|Dniester River]] (in [[Ukraine]]).<ref>{{Cite web|title=Planetary Names: Vallis, valles: Tyras Vallis on Mars|url=https://planetarynames.wr.usgs.gov/Feature/6169?__fsk=1750481306|access-date=2021-09-26|website=planetarynames.wr.usgs.gov}}</ref>
<gallery class="center" widths="190px" heights="180px" > Image:Tyras Vallis Fan Deposit.JPG|Tyras Vallis Fan Deposit, as seen by [[HiRISE]]. Click on image to see layers.
Image:Tyrasvallis2.JPG|Tyras Vallis Fan Deposit at a different sun angle. The scale bar is 500 meters long. This image is just to the right of the previous image.
Image:Layers in Monument Valley.jpg|Layers in Monument Valley. These are accepted as being formed, at least in part, by water deposition. Since Mars contains similar layers, water remains as a major cause of layering on Mars. </gallery>
== References == {{reflist}} {{Geography of Mars}} {{Portal bar|Solar System}}
[[Category:Lunae Palus quadrangle]] [[Category:Valleys and canyons on Mars]]
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