Close The controls on the major and trace element variation of shales, siltstones, and sandstones of Pennsylvanian–Permian age from uplifted continental blocks in Colorado to platform sediment in Kansas, USA,
Cullers, R. L. (1994) (1994),
Geochimica et Cosmochimica Acta, 58 p. 4955–4972,
10.1016/0016-7037(94)90224-0.