the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > sandstone > greensand
greensand1700
fox-mould1808
carstone1815
malm rock1833
potash greensand1869
1869 Ann. Rep. Commissioner Agric. 1868 402 in U.S. Congress. Serial Set (40th Congr., 3rd Sess.: House of Representatives Executive Doc.) XV Calcareous Marls and Potash Greensands.