Carboniferous sandstone on Pendle Hill

We climbed Pendle Hill. I was intrigued by the description of the rock as "Carboniferous sandstone". I have normally heard "carboniferous" applied to limestone. It also occurred to me to wonder if the label which was about the UK being in tropical conditions with swamps and coral seas actually applied to the whole world. The answer appears to be "no" if this is anything to go by. https://en.wikipedia.org/wiki/Carboniferous The rocks we found on Pendle were indeed sandy. See particularly the path which is made of rocks dug out of the trench to the side of it. The close up shows large visible grains. Mostly the colour is far paler than the desert sandstones of the the Eden and Wigton area. The suggestion is that these sandstones were deposited in a river delta http://www.kabrna.com/cpgs/stratigraphy/regional_map.htm