Fluvial Environments - Trace Fossils as Indicators of Sedimentary Environments - page 333

FIGURE 3 Examples of characteristic trace fossils of the Coprinisphaera (A-E) and Celliforma
Ichnofacies (F). (A) Teisseirei and Coprinisphaera . (B) Coprinisphaera . (C) Uruguay and Mones-
ichnus . (D) Coprinisphaera , Monesichnus , Teisseirei , and many Uruguay specimens. (E) Isolated
Coprinisphaera in cross section. (F) Rebuffoichnus . The examples are from paleosol profiles of the
Oligocene Upper Puesto AlmendraMember of the Sarmiento Formation in Chubut province, Argen-
tina (A and B); from lateritic nodular horizons (C and D) and lateritic hardpan (E) of the Eocene
Asencio Formation in Uruguay; and from the Late Cretaceous Bajo Barreal Formation in Chubut
province, Argentina (F). Co, Coprinisphaera ; Mo, Monesichnus ; Re, Rebuffoichnus ; Te, Teisseirei ;
Ur, Uruguay .
1997 ), and the Eocene-Miocene Sarmiento Formation of Argentina (e.g.,
Bellosi et al., 2010 ). These assemblages display an absolute dominance of
chambers and chambered burrow systems (e.g., Coprinisphaera , Teisseirei ,
Eatonichnus , Rebuffoichnus , Feoichnus , some ichnospecies of Cellicalichnus ,
Celliforma , Palmiraichnus , Uruguay , and rare Krausichnus ; see Fig. 3 A-E),
and a secondary participation of J-, U-, or Y-shaped vertical burrows