Re: water flow 68 degrees south on Mars
Nice example of the fluid-flow channels. Generally Malin & Edgett's water spoor is at lower latitudes, but the map in their paper shows one area they call the "Polar Pits" right about where this image was taken. It may already be in their catalog.
You're probably familiar with Kiefer's work at USGS/Flagstaff on the "spider" formations. Have you contacted him about it? Your site at martianspiders.com is certainly a testimony to your interest. But why, forgive me for asking, don't you use the MOC-O-Matic to clean up the images a little more?
--Robert