monazite and zircon
monazite has been researched along with zircon* in 1 studies
Other Studies
1 other study(ies) available for monazite and zircon
| Article | Year |
|---|---|
Discoidal impressions and trace-like fossils more than 1200 million years old.
The Stirling Range Formation of southwestern Australia contains discoidal impressions and trace-like fossils in tidal sandstones. The various disks have previously been linked to the Ediacaran biota, younger than 600 million years old. From this unit, we report U-Th-Pb geochronology of detrital zircon and monazite, as well as low-grade metamorphic monazite, constraining the depositional age to between 2016 +/- 6 and 1215 +/- 20 million years old. Although nonbiological origins for the discoidal impressions cannot be completely discounted, the structures resembling trace fossils clearly have a biological origin and suggest the presence of vermiform, mucus-producing, motile organisms. Topics: Animals; Crystallization; Fossils; Geologic Sediments; Metals, Rare Earth; Movement; Mucus; Silicates; Time; Western Australia; Zirconium | 2002 |