Robuta

https://popups.ulg.ac.be/0037-9395/index.php?id=1694 Correlation of uppermost Devonian and Lower Carboniferous miospore zonations in Byelorussia, Poland... lower carboniferous correlation uppermost devonian miospore https://www2.bgs.ac.uk/mendips/rocks/lowerC_rocks.htm Lower Carboniferous rocks (359 to 327 million years ago) | The rocks of Mendip | The Geology of the... The Lower Limestone Shale, or Avon Group, is up to 150 m thick in the western Mendips. million years ago lower carboniferous rocks mendip geology