Pliocene Lignite Bed U.S. Geological Survey

Eocene deposits hi-res stock photography and images - Alamy

Full article: Middle Miocene wetland fungi from the Adamów Lignite

Geological map of the Ptolemais Basin showing the major fault

PDF) The nature and origin of bed-parallel slip in Kardia Mine

Energies, Free Full-Text

Energies, Free Full-Text

Applied Sciences, Free Full-Text

Paleobotanical evidence for the post-Miocene uplift of the Cascade

Lignite Coal U.S. Geological Survey

USGS: Geological Survey Bulletin 1493 (Early History)