His is better I think as it shows the blob which is making the track and it has just gone over a small wind ripple. Actually in this photo it looks like a rope or stick or maybe just a long snake/worm? I will have to have a look at goggog's thread again. The one I posted is from sol 848
This photo shows either a crack or a track and I am not sure which. There are several other photos of it but this one probably shows best what I am talking about. NASA obviously thought it was worth some further investigation too.
I have found what I thought was a track in the past but that could have been a small pebble or rock rolling down a small slope. here
At the right hand end of the crack/track it appears to go vertically upwards which may or may not be significant.
added this image
-- Edited by qmantoo on Monday 17th of January 2011 06:41:41 AM