I noticed these branch like features in the large PAM-CAM from Opportunity




I only know of two ways to form these kind of structures form in rock
1. Fossil remains of something (plant stem/Worm Tube/organic structure/ect.)
2. Formation growth in water


I really think this is a signnificant feature in the PAM-CAM





Nasa's raw images can be found here ... (Assuming NASA doesn't move the links)
Raw1
Raw2
Raw3
Raw4



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