Mysterious ridges at the mouth of Tiu Valles

There were images taken by a High Resolution Stereo Camera (HRSC) on board Mars Express which show the mouth of the Tiu Valles channel system on Mars. The pictures were taken in orbit with its ground resolution roughly being 16 meters per pixel. The mouth of Tiu Valles is an estuary-like landform. On Earth, an estuary is the tidal mouth of a river valley, or the end that meets sea and fresh water comes into contact with seawater. In areas like this, tidal effects are present. Visible in the lower part of the image are remnants of a once 'streamlined' island. Really quite amazing, I encourage you all to read about it.

http://www.marstoday.com/news/viewsr.html?pid=25549