Mariopteris, most likely Mariopteris nervosa, a liana-type seed fern from the early Carboniferous.
Conifer cone from Poland.
Middle-Pennsylvanian Asterotheca miltoni from Mazon Creek, IL, USA.
Rutile needles exsolved on the surface of a biotite grain from the Devonian-aged Tioga bentonite exposed in Seven Fountains, VA.
Sample provided by Dr. Dan Doctor, US Geological Survey.
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