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this was in amongst a load of sandstone slabs we got for the garden. It looks like a conifer but is this right? The stone is imported but not sure where from.
A lovely example of a pseudo-fossil dendrites, these structures are not actually fossils at all, but are formed by branching oxides and hydroxides of iron and manganese along fissures or bedding plains in strata.
Rhys is spot on - these are pseudofossil dendrites. More pseudofossils to enjoy here: http://www.nhm.ac.uk/natureplus/community/identification/blog/2011/05/24/im-afraid-its-not-a-fossil-my-favourite-pseudofossil-ids