Marble with fossils at Hanley Bus Station
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Tom - I NO expert.
...this is likely to be limestone - the visual differences are subtle but marble forms when limestone is subjected to enormous heat and pressure. This causes the calcite to recrystallise, usually wiping out all but the faintest traces of the largest fossils in the process.
That does not actually make what you show IS Limestone but it's a fair bet. In any case read here http://www.hardscape.co.uk/completed-project.php?completed_project_id=46
I should say that there are some wonderful examples of fossils in Marble!
The marks are likely to turn out to be Marine (ex!) residents and, as such, there's a fair bet they are molluscan (invertebrates). Cast about on those surfaces, if you can, and look for imprints of the shell surfaces, not just the outlines.
THREE MARINE PROJECTS
Lat/Lng: 53.0269, -2.175
OS grid ref: SJ883477