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An outcrop of the Mississippian Hartselle Sandstone in north-central Alabama preserves in situ, erect cormose lycopsids, assigned to Hartsellea dowensis gen. and sp. nov., in association with a low diversity bivalve assemblage dominated by Edmondia. The isoetalean lycopsids are rooted in a silty claystone in which the bivalve assemblage occurs, representing the transition from tidal flat and tidal channel regime into a poorly developed inceptisol. Two paleosols are preserved in the sequence and each is overlain by a fine-grained quartz arenite, responsible for casting aerial stems and cor-mose bases of the entombed plants. The massive quartz arenites are in...

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