I have had a good look at the full image and the first thing I noticed is that the original tiff download is a negative. Very confusing to say the least.
The image shown below is a cropped section from the lower half of the full tiff image. The second image is a reversal of the same. I will post an enhanced version later.
There are many interesting features to view in the second image.
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"All truth passes through three stages. First, it is ridiculed; Second, it is violently opposed; Third, it is accepted as being self-evident."
Nice link...it looks to me as natually growing scrub bush on the sandy - inside the trench. This is all over mars and is most likely one of the main 'airbrush/smudge' features being obfuscated on the images.
Fascinating image...it intrigues me of possible beache sandy plant growth but like you siad it could possibly be a gunnery bomb range. I'll look into it.
Thanks Tw for finding the links. I want to add that I haven't altered the image I've posted. Not in any way. It's interesting that the limages you have provided links to are so different isn't it? I wonder why this is? They seem to have been purposely fogged over somewhat, the reasons for this would be good to find out.
The image below I find pretty difficult to categorize. I can't decide whether or not it's biological, warfare or blanket obfuscation. Some of the dark patches make me think of bomb crater splashes, whilst others make me think it could be bio. It's reminiscent of mould that you would see in damp places such as showers and windows. I have been waiting for Mr. Skipper to release his Warfare Evidence reports, then I could have compared the picture to any that he would produce in said reports. But, he is either not ready or reticent about publishing these.
I attempted to send it to Timewarp so he could peruse it, but alas there is no attachment facility in the messages section of the Website.
I've had this image on my pc for a couple of years now and I'm afraid I can't remember the Site that I downloaded it from, hopefully the image number may help someone track it down.
About halfway down on the extreme left of the picture is what looks like the figure 2. This could just be coincedience but it looks too good to me for it to be a coincedence.