The fossil comes from the Carboniferous, a period in geological ... fossils had been preserved—this rarely happens because the sandstone composition in Northumberland doesn’t easily allow ...

Coarse layers of sedimentary rock interspersed with fossil-rich, oxidized-red wafers of sandstone shale form ... revealing secrets of the early Carboniferous in future studies.

with only a slight revival in the far north during the time of the Upper Old Red Sandstone, and how it broke out again with great vigour at the beginning of the Carboniferous period. Sir Archibald ...

This time period took place 359 to 299 million years ago. 3 min read The Carboniferous period, part of the late Paleozoic era, takes its name from large underground coal deposits that date to it.