Water plays a critical role in erosion and sediment transport and this relationship is most
evident in the hyperarid Atacama Desert of Northern Chile, a region characterized by …

Marine siliceous deposits of cherts are known to have formed since the Archean and reflect
the biogeochemical Si cycle, comprising the burial of Si in sediments during diagenesis. The …

In the wake of rapid CO2 release tied to the emplacement of the Siberian Traps, elevated
temperatures were maintained for over five million years during the end-Permian biotic …

Permian chert successions were geographically extensive, spanning from the
palaeoequator to the northern high latitudes. Large-scale chert production was abruptly …

The earliest evidence of complex macroscopic life on Earth is preserved in Ediacaran‐aged
siliciclastic deposits as three‐dimensional casts and molds, known as Ediacara‐style …

Abstract The Ediacara Member of the Rawnsley Quartzite in South Australia is characterized
by exceptional preservation of soft-bodied organisms as casts and molds in sandstones. To …

Silica accumulation in the Yangtze Sea during the Ordovician–Silurian (O–S) transition
appears to have coincided with global climatic fluctuations, widespread upwelling, and …

Foraminifera are unicellular eukaryotes known to have a shell, called a test, generally made
of secreted calcite (CaCO 3). For the first time, we report a foraminifera with a composite …

The geologic history of dissolved silica concentration in the ocean (DSi) is central to
understanding the evolution of silica biomineralization, the interactions between the global …

In today's oceans, diatoms are abundant and diverse primary producers distinguished by
their silica shells. Although molecular clocks suggest that diatoms arose as much as 250 …