Tatman FormationThe Tatman Formation is a Wasatchian geologic formation in Wyoming. It preserves fossils dating back to the Ypresian stage of the Eocene period.Fossil contentThe following fossils have been recovered from the formation:FloraAllantoidiopsis erosaCercidiphyllum genetrixCnemidaria magnaDombeya novimundiEugenia americanaLygodium kaulfussiPlatanus wyomingensisPlatycarya castaneopsisPopulus meigsiiSalvinia preauriculataThelypteris iddingsiiZingiberopsis isonervosaAlnus sp.Equisetum sp.aff. Typha sp. Alismataceae indet. Monocotyledoneae indet.