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4 results for “Tonian”
Data from: First record of organic-walled microfossils from the Tonian Shiwangzhuang Formation of the Tumen Group in western Shandong, North China
<p>Organic-walled microfossils offer an important window onto the biospheric evolution in pre-Cryogenian and provide biostratigraphic implications for many Proterozoic fossiliferous sequences which are poorly age constrained for the lack of reliable radiometric date. Recently, macroscopic carbonaceous compression fossils have been reported for the first time from the Tonian Shiwangzhuang Formation of the Tumen Group in western Shandong, North China. However, organic-walled microfossils have never been discovered in the Shiwangzhuang Formation before. To improve our knowledge about Proterozoic biodiversity in North China, we conducted a micropaleontological survey on the argillaceous limestone samples of the Shiwangzhuang Formation, which also contain macroscopic carbonaceous compression fossils, from the Baishicun section in Anqiu, Western Shandong, North China. Our investigation shows that the Shiwangzhuang microfossil assemblage is dominated by smooth-walled sphaeromorphic acritarchs and cyanobacterium-like filaments and relatively low abundance of other acritarchs, including 15 taxa, such as <i>Polysphaeroides filliformis</i>, <i>Ostiana</i> <i>microcystis</i>, <i>Simia annulare</i>, ?<i>Jacutianema </i>sp., <i>Pellicularia tenera</i>, <i>Polythrichoides lineatus</i>, and <i>Navifusa actinomorpha</i>. The Shiwangzhuang organic-walled microfossil assemblage, although consisting of long-ranging taxa and without age diagnostic taxa, is not contradictary with a Tonian age suggested by macroscopic carbonaceous compression fossils,<i> </i>including the <i>Chuaria</i>-<i>Tawuia </i>and <i>Sinosabellidites</i>-<i>Protoarenicola</i>-<i>Pararenicola </i>assemblages, revealed from the same horizon of the Shiwangzhuang Formation and organic-walled microfossil assemblage, including the late Mesoproterozoic to Tonian index fossils <i>Trachyhystrichosphaera aimika</i>, from the underlying Tongjiazhuang Formation. However, it is also worth noting that a Cryogenian or Ediacaran age cannot be completely excluded based just on the microfossils because of their limited biostratigraphic utility.</p>
Data from: First record of organic-walled microfossils from the Tonian Shiwangzhuang Formation of the Tumen Group in western Shandong, North China
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Systematic paleontology of macroalgal fossils from the Tonian Mackenzie Mountains Supergroup
<p>Proterozoic eukaryotic macrofossils are rarely preserved with enough morphological detail to inform their phylogeny. This dataset includes the measurements and descriptions of three size classes of filamentous fossils from the Dolores Creek Formation of the Mackenzie Mountain Supergroup in the Wernecke Mountains, Yukon. This data was used to systematically describe and interpret the middle size class specimens as green macroalgae with an unbranching, uniseriate thallus (with uniform width throughout; n=304, width = 0.20 to 0.85 mm) and elliptical to globose anchoring holdfast. Fossils from the smaller size class (n = 90, width = 0.03 to 0.06 mm) retain too little morphological information to define properly. However, a third form is also documented, consisting of a ribbon-shaped thallus with a consistent width (n=19, width = 1.0 to 1.7 mm). The size range of these different, likely photoautotrophic, filaments supports the hypothesis of an increasing morphological complexity and overall diversification of macroalgae during the Tonian, setting the stage for dramatic changes to benthic marine ecosystems prior to the evolution of more complex ecosystems.</p>
Systematic paleontology of macroalgal fossils from the Tonian Mackenzie Mountains Supergroup
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