SOS Posted June 24, 2017 Share Posted June 24, 2017 I've just returned from a trip to runswick bay in Yorkshire England. here is one of my finds, it's really smooth on the outside. Maybe someone knows what it is. Link to comment Share on other sites More sharing options...
TqB Posted June 24, 2017 Share Posted June 24, 2017 It's part of a pyrite coated limestone concretion, probably from the Mulgrave Shale Member (formerly "Jet Rock"). 5 Tarquin Link to comment Share on other sites More sharing options...
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