fossil in sandstone slab in a garden
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I have some similar fossils in sandstone flags on my patio
I think it is a vein of mineral rather than a fossil, the formation would be called dendritic ("tree like")
I am inclined to think this is non-organic dendritic crystallisation. It is not uncommon to find this sort of thing in Torridonian sandstone - much older than any fern.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Yes, that's exactly what it is - probably manganese oxide, which often grows like this over bedding surfaces or along joints (fine fractures in the rock). They can produce some very pretty tree-like patterns,
Lat/Lng: 55.9899, -2.7234
OS grid ref: NT549776