with over 70 ancient fish species already identified within its limestone walls. This makes it one of the most significant ...

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.

Figure caption, The sand dunes grow and establish a succession of plants and wildlife The sand dunes at Merthyr Mawr are very unusual because they have formed against a carboniferous limestone ...

The structure of the valley is split, with Upper Wharfedale consisting of carboniferous limestone of the Yoredale series. Yockenthwaite, Upper Wharfedale. (Pic credit: Bruce Rollinson) In the ...