According to "Canny edge detector" it looks as it is shown here; does it give any additional meaning?!
The pale blue layer seems overlapping the pale brown lower layer. In this respect the wormlike structures are remnants of a leyer which is in superposition on the lower one. The worm-like structures may be a meandering subset of the pale blue layer, which had been strengthened by a streaming-seepaging fluid. Is this observation true? Did this observation approach to solve your question? With the best. B. Sz.
Yes Szaniszlo, and the meandering structures seem to be more rigid than the bedrock. Erosion might then have prepared them the way they look now.
More, the largest structure on the left reveals a crack at the bottom, which allows to look into its interior. This interior seems to be inhomogenous, composed of a dense bluish matrix and white clasts. Hard to interprete ...
They surely look like structures present on Earth: fragmented erosional structures (similar to deformed gutter casts), trace fossils infilled with different material (from the layer above - burrows) or structures developed as diagenetic changes of the primary composition (concretions). Very interesting! Best regards.
Not sure what the scale is, but they definitely look like trace fossils found on Earth except that the cross-section looks too rectangular. Also looks like two sets of fracture patterns are present at about 70 degrees to each other. Also looks like one void in the middle of the photo (filled with grains) that could have also been one of the "trace fossils" before it fell out?
In my opinion not dessication cracks but possibly more like syneresis cracks.
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