title: Tyras Vallis
text: # Tyras Vallis
  
  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 River (in Ukraine).
  
  * Tyras Vallis Fan Deposit, as seen by HiRISE. Click on image to see layers.
  * 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.
  * 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.
  