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Hi, I'm new to the forum Can anyone help me identify this fossil, I was thinking maybe an ant's nest or burrows, or a sponge...? Any help appreciated... It's a flat round-ish rock about 6cm in length
I think you're seeing borings in a piece of rock, possibly limestone.
There are various creatures that can bore in wood and rock; some do it by physical abrasion, some use chemicals. What made these particular holes, I'm not sure.
I also can't be sure of they are recent or fossil (sometimes the material filling fossil borings can be preferentially dissolved- or eroded out).
So... ...not a very useful answer; maybe somebody else here can offer better insight.