User:Hazen22a/sandbox



= Archaeonassa = Late Ediacaran Archaeonassa-type trace fossils are commonly preserved on the top surfaces of sandstone strata. "Archaeonassa is a poorly known ichnogenus, originally described from the Cambrian of North America, which is a member of the Scolicia ’group’, but can be regarded as distinct from Scolicia" Its know for being produced by invertebrates like arthropods and mollusks. Archaeonassa are a certain type of Cambrian trace fossil and are also shown as burrows. They are twisted about and are irregular in form. "The flanking ridges are very well developed, and locally display an undulating morphology. In cross-sectional view the median groove commonly displays a V-shaped morphology." They were origanlly compared to a base model but scientist found that they fell into a "taxonomic grey zone concerning its availability"