Browsing by Subject "coal ball Alethopteris pteridosperm permineralized Carboniferous seed fern leaf geometry paleobotany"
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(2011-08-04)This research focuses on a new morphology of Alethopteris, the frond of a Carboniferous seed-fern tree, based on a series of orthogonal cross-sections of the leaflets, which are preserved in coal balls. The coal balls, ...