2002/01/01 by Dmitri Grazhdankin, Dmitriy Grazhdankin, Adolf Seilacher · 6 citations
Earth and Planetary Sciences · #Paleontology and Stratigraphy of Fossils #Geological formations and processes #Geology and Paleoclimatology Research
paper · pdf · doi:10.1111/1475-4983.00227
The late Precambrian fossils from Namibia have generally been regarded as soft‐bodied organisms whose three‐dimensional preservation resulted from smothering in fluidized sand. The sedimentological context of Pteridinium and Namalia within a sandstone bed, however, allows us to distinguish between two taphocoenoses: (1) winnowed, laterally collapsed, current‐transported specimens accumulated as a lag deposit of turbidite‐like flows, and (2) specimens ‘floating’ in the top part of an event bed with their vanes extending upwards to the upper bedding surface. The second taphocoenosis is interpreted as an in situ preserved ‘infaunal’ community. The immobile underground life habit and the bizarre modes of growth of Pteridinium and Namalia do not fit any extinct or modern group of multicellular organisms. Similar statements can be made for Ernietta and Rangea , thus reviving the Vendobionta hypothesis.