Pliocene Lignite Bed U.S. Geological Survey

Geochemistry of the Saouaf Formation lignite levels (Serravalian

Detailed location of areas transformed by underground lignite

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PDF) The origin of pale and dark layers in Pliocene lignite

A possible link between Balkan endemic nephropathy and the

Geologic assessment of undiscovered gas resources in Cretaceous

KGS--Geologic Studies in Southwestern Kansas--Stratigraphy

Systematic Overview of the Pliocene Molluscs and Barnacles of the

Field observation of fossil wood remains in the lignite seam. (a

Map illustrating the recon structed extent of the Pliocene Lake