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What are these fossils and what period might they have been alive
Fiona - are you looking? - Could do with your comment...
To me they look rather like frondescent fracture patterns.
Or just maybe frondescent marks sensu
DÅ¼uÅyÅski & Walton 1965 ('Sedimentary features of flysch and greywackes'), p.153
(one of my old text books!)