What would cause this?

[LuckyPepper]

I was detecting on an island and came across this rock. I've never seen anything like it. Could being wedged between the 2 trees cause the grooves? Just years and years of pressure. Or is it more likely that rain falling from the trees created them? Thanks in advance for any info provided.

 

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[Bajahunter]

Looks like old weathered granite.
I think your second supposition is correct. There is no way the trees could put enough pressure on the rocks to fracture them. They would just grow around.

 

[LuckyPepper]

Thank you for your reply,have you seen many rocks do this?

 

[Robot]

One of the "Strongest Elements" in Nature - A Drop of Water!



Frost Wedging
Water droplets from the trees cause small cracks and each year with this water freezing and carving larger cracks.


Interesting Pic of Granite bolder with the start of similar formation!

 

[LuckyPepper]

Amazing!