Figure 3. Macro and microscopic diagnostic features of Argentinian discoidal fossils.

(A) Positive epirelief view showing a structure similar to an attached stalk and frond. A white arrow points the putative connection between the holdfast and the stem. (B) Detail of a complete specimen, including a structure interpreted as a possible set of holdfast and frond. Note that the structure that supposedly corresponds to a recumbent frond overlaps at least four small discs. (C–F) Two full-relieves of discs in cross section ascribed to Aspidella (C–F) are parts and counterparts of the section). Scales: (B), the coin has 2.5 cm in diameter; (C–F), 1 cm.