Found this stone in Bulgaria, near Godech village, on a side of a hill. Please share some ideas on what this could be and what could have made this formation. Thank you in advance.
Possibly a softer layer in the host rock that has washed out from a natural occurrence. Just a guess. An awesome specimen though!
I see this is your first post so welcome to TNet.
MineLab E-Trac, MineLab Safari, MineLab Explorer XS,
White's 5000 D, White's 6DB, White's 5000 D GEB
Sunray X-1 for the ML's, Garrett PP for the White's and a Backhoe
I think it may be a prehistoric example of an early earthquake measuring device. From the way the line jumps upwards at the end I'd say it was at least an 8.6 on the rock-ter scale.
Rustygold offers the best advice in my opinion. It could also have been a crack or vug at sometime that erroded out as well is all I can add. It does smile at ya though. Hehh