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Curiosity ChemCam Remote Micro-Imager photo of novel stick-like features, taken on Dec. 31, 2017.
Credit: NASA/JPL-Caltech/LANL
"These features are very small, probably on the order of a millimeter or two (0.04 to 0.08 inches) in width, with the longest of the features stretching to roughly 5 millimeters (0.2 inches)."
https://www.space.com/39294-mars-rover-curiosity-weird-tube-structures.html
"They look remarkably similar to Ordovician trace fossils I have studied and photographed here on Earth,"
Barry DiGregorio
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NASA's Mars rover Curiosity captured this image on Jan. 2, 2018, with its Mars Hand Lens Imager (MAHLI). Using an onboard focusing process, the robot created this product by merging two to eight images previously taken by MAHLI, which is located on the turret at the end of the rover's robotic arm.
Credit: NASA/JPL-Caltech/MSSS
While at present it remains unclear whether or not the mystery structures really are the fossil remnants of some ancient alien species, NASA scientists are currently not ready to rule out the possibility.
"If we see more of them... then we begin to say that this is an important process that's going on at Vera Rubin Ridge," said Curiosity project scientist Ashwin Vasavada.
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For comparison here are some
trace fossiles from earth:


Exciting times....