Fingering on dike walls

During one of our field trips in Israel we were shown these interesting fingering like structures in sandstones. They occur at the interface to magmatic dikes. The idea is that the direction of the fingering (from left to right) give the direction of dike intrusion.

The structures are very similar to structures that develop in porous media (sand) with two fluids (for example air and water). We had lively discussion in the field about these structures.

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