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Looks like a block of limestone. Is it in a garden? Rockery stone, maybe? Why did you post this? Are there some fossils in it?
University of Edinburgh and Biodiversity Observatory (OU)
Is it an ants nest ? looks like eggs in hollow and on soil
Yes it does cover an ant's nest. I believe it to be a large fossil noted for its rope lattice effect formed from floating algae in a tropical sea. It may also have a lens shape, convex and concave. I have seen one before on this SNCI and thislooks similar. Can you see the lattice effect?
Thanks very much Peter.
These are 'trace fossils' - preserved evidence of animal activity -, rather than the remains of the organisms themselves ('body fossils'). What you see here are the casts of burrows on what would have been the underside of a bed of limestone, the burrows having originally been excavated into some underlying layer of softer sediment (probably mudstone), now eroded off. Their horizontal (i.e., bed-parallel) orientation and Y-shaped branching pattern are typical of the kind of trace fossil called Thalassinoides, made today by burrowing detritus-feeding shrimps (callianassids): old burrows may be back-filled, hence casted, by the animals with faecal pellets, so preserved as you see them here. Judging from the locality you give, they probably come from Middle Jurassic limestones (in which Thalassinoides is quite common).
Fascinating! Thanks, Peter.
I will re-classify this observation into invertebrates. (More accurate than plants where it is at the moment).
Lat/Lng: 51.3, -2.5
OS grid ref: ST7165