In the quest for the proof of life on Mars. past, present, or transient, the real answer may be found in some very major find, which is yet to happen. On the other hand, it may also be found in a plethora of small anomalies, which are even now just too many in number to disregard.
Well, along the line of "small anomalies", in this submission, I am posting three small Martian anomalies, with a possible fourth, all clearly defined in a single Rover Opportunity Photo screenshot, taken at the Concepcion Crater. These are just a few of the several anomalies to be found around this crater. Actually, in my opinion there are enough "anomalies", right here at this crater, to satisfy most that the positive proof is evident enough. I will be posting other Concepcion anomalies from time to time.
In this screenshot, on the left, you will see a single metal-looking round headed stud, which is attached to a rectangular piece of some sort. If we had done it, it might have been a piece of plywood, with a stud. :)
Toward the middle of the screenshot there is a brown object that looks exactly like a woven basket of some type. Of course, one absolutely cannot make a woven basket from "Mars rocks and sand", so where would the "material" come from, on Mars, to make such a basket???? And who would be making a basket???
To the far right of the screenshot, are more of the same metal-looking studs. Here there are four of them, and they seem to be lined in a row. Even though we can only see the upper part of these studs, we can guess that they are driven into the rock they are seen upon.
Also in the mid part of the screenshot is another interesting object. It appears to be rectangular, and seems to have legs. It could be a table type of object, but it cannot be clearly seen, as can the other anomalies.
I will post the screenshot, for these anomalies, and I will post a link to a full Concepcion Crater mosaic of the Rover photos.
Rover mosaic link: http://www.nivnac.co.uk/mer/images/B2138_42_concepcion_full.jpg
In the link, magnified, you can find these anomalies on the nearer side of the crater - look closely!