The ichnogenus Dictyodora from late Silurian deposits of central-western Argentina: Ichnotaxonomy, ethology and ichnostratigrapical perspectives from Gondwana

The unusual record of Nereites, wrinkle marks and undermat mining trace fossils from the late Silurian–earliest Devonian of central-western margin of Gondwana (Argentina)

“…Manassero et al, 2009). Locality 1 coincides with the outcrops recently revisited by Pazos et al (2015) where Dictyodora was studied in detail. It is situated between Nihuil dams 1 and 2 along the Atuel River in Atuel Canyon (GPS coordinates: 34°57.529′ S and 68°36.…”

“…8). The trace fossils studied by Pazos et al (2015) referred to the ichnogenus Dictyodora and associated ichnospecies are only briefly described here to avoid duplicated descriptions. Trace fossils associated with microbial mats are described separately as a record of undermat mining and are only identified to ichnogenus level, since more material is necessary for a more precise assignment.…”

“…The material described as Nereites isp. by Pazos et al (2015) presents some of the diagnostic features of this ichnospecies, such as a wider central tunnel with backfill and thin reworked sediment at both sides. However, another feature diagnostic of N. irregularis, the guided and frequently tight meanders, as in N. cambrensis, is not present here.…”

“…Based on the stacking pattern, the facies trend, charcoal abundance, and plant remains, they interpreted them as the record of a deltaic system. Pazos et al (2015) described turbidite-like deposits with convolute lamination and asymmetrical climbing ripples, and also documented wrinkle marks that provide evidence of patchy microbial mats on bedding planes (Pazos et al, 2015, fig. 2b, and this paper).…”

“…Recently, Pazos et al (2015) studied the ichnogenus Dictyodora Weiss, 1884 in Atuel Canyon and also mentioned the ichnogenus Nereites.…”