Organic-walled microfossils from the Proterozoic Thule Supergroup, Northwest Greenland

Kotuikan Formation assemblage: A diverse organic-walled microbiota in the Mesoproterozoic Anabar succession, northern Siberia

“…8.7, 8.9 and 8.10). This fossil has been identified as Pterospermopsimorpha pileiformis and is similar to other microfossils of this type described from many Mesoproterozoic or Neoproterozoic formations, e.g., the Bylot Supergroup of Canada (Hofmann and Jackson, 1994), the Thule Supergroup of Greenland (Samuellson et al, 1999), the Satka Formation of Urals (Sergeev and Lee Seong-Joo, 2004;Sergeev, 2006) and the Russö Formation of Spitsbergen (Knoll and Calder, 1983). Pterospermopsimorpha is questionably compared to green algae (Teyssèdre, 2006;Moczydłowska et al, 2011), but it is definitely a eukaryotic microorganism due to its large size and double-walled envelope.…”

Strelley Pool Formation

“…Their morphology was initially described as spindle shaped, which merely represents a two-dimensional equatorial perspective. Similar microfossils have been reported from the contemporaneous (~3,416-3,334 Ma) Kromberg Formation in the Barberton greenstone belt, South Africa (Walsh 1992), and from the middle and the upper Proterozoic rocks (Samuelsson et al 1999;Schopf and Klein 1992), although their biological affinity is not known. Wacey et al (2011a) also reported carbonaceous spheroids and tubular filaments in the basal carbonaceous sandstone of the SPF in the East Strelley Pool greenstone belt.…”

Archean coastal-plain paleosols and life on land

“…Some (Timofeev, 1966), or more than two blunt-ending projections (Eisenack, 1972;Yankauskas, 1980;Samuelsson et al, 1999), unlike the acutely tipped, simple-walled spindles of the Farrel Quartzite. The Farrel Quartzite spindle-shaped microfossils are commonly clustered with their ends continuous with filaments that appear to join them together, and, in addition, have small internal bodies (Sugitani et al, 2007).…”