== Help with ages of rocks of the Mendip Hills == 

 Hi, Could any experts in UK geology help me with the Mendip Hills article. It is currently an FA candidate & another editor has queried the accuracy of the geology section. The article says  

 "The Mendip Hills are the most southerly Carboniferous Limestone Upland in Britain and are comprised of three major anticlinal structures, each with a core of older Devonian sandstone and Silurian volcanic rocks. The latter are quarried for use in road construction and as a concrete aggregate.  

 200 million years ago the Mendips were considerably higher and steeper than they are today.  Since then weathering has resulted in a range of surface features, including gorges, dry valleys, screes and swallets. These are complemented underground by a large number of caves, including Wookey Hole, both beneath the plateau and at the base of the southern escarpment. There are also limestone pavements, karst and a number of gorges, most famously Cheddar Gorge and Burrington Combe. Springs, a number of which deposit tufa, are a particular feature of the eastern part of the hills." 

 & the challenge is: 

 "Geology If it's Carboniferous Limestone, there's something wrong—or insufficiently explained—about the reference to "200 million years ago" (which is roughly Triassic/Jurassic). You'd better check this. It's not necessarily wrong, but the Carboniferous was roughly 360-300 Mya. US geological usage divides the Carboniferous into Mississipian & Pennsylvanian: I suggest you make it clear in which period the Mendips were formed " 

 Does anyone have the expertise to edit/ correct/ explain the article? Any help appreciated.—