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A partially silicified stem fragment of an arborescent lycopsid, tentatively identified as Leptophloeum rhombicum, is documented from peritidal carbonates in the Palliser Formation (Upper Devonian; Famennian) of southwestern Alberta. An unlikely inhabitant of these tidal flats, the log must have rafted in from a relatively nearby land area. The most probable candidate sources are either the Kootenay island arc to the paleo-northwest or hypothetical Montania to the southwest. The specimen is evidence that either or both these equatorial areas had a humid paleoclimate and vegetated coastal marshes and swamps.

canadian journal of earth sciences

An arborescent lycopsid stem fragment from the Palliser Formation (Famennian) carbonate platform, southwestern Alberta, Canada, and its paleogeographic and paleoclimatic significance