Figure 2. Size variation and morphology of Aspidella plexus from the Cerro Negro Formation, La Providencia Group.

(A,B) Samples showing several specimens with great variation in size. (C) Medium sized (around 35 mm) discoidal convex specimen with a small boss in the center and very low creases, preserved as negative epirelief (upper) and full relief (lower). (D) Pavement showing several specimens with puckered features. (E) Detail of negative epirelief specimen with radial folds (puckered features) and invaginated center. (F,G) Specimens with invaginated centers preserved in negative epirelief, with a full relief specimen counterpart. Scales: (A), 10 cm, (C,E,F), 1 cm, (B) the hammer is 27,9 cm long.