Oolitic ironstones are iron-rich and chert-poor sedimentary rocks containing concentrically
coated grains composed of iron (oxyhydr) oxides and iron phyllosilicates that offer a unique …

Over the past two decades, advancements in geochronological, sedimentary, and
geochemical studies have considerably deepened our understanding of the links between …

Iron is a remarkable element in its relatively high abundance for its mass and its sensitivity to
(and control of) redox on a planetary scale over geologic time. Numerous volumes have …

Upper‐flow‐regime bedforms, including upper‐stage‐plane beds, antidunes, chutes‐and‐
pools and cyclic steps, are ubiquitous in glacigenic depositional environments characterized …

Fossilized carotenoid hydrocarbons provide a window into the physiology and biochemistry
of ancient microbial phototrophic communities for which only a sparse and incomplete fossil …

The reason for the abundance of dolomite lithologies in Earth's early geological record
compared to modern environments remains contentious. This study provides new insight …

Banded iron-formations (BIFs) are marine chemical sedimentary rocks composed of
siliceous and ferric materials, usually with typical thin layers or sheet structures. BIFs not …

The snowball Earth hypothesis—that a runaway ice-albedo feedback can cause global
glaciation—seeks to explain low-latitude glacial deposits, as well as geological anomalies …

The Earth's most severe ice ages interrupted a crucial interval in eukaryotic evolution with
widespread ice coverage during the Cryogenian Period (720 to 635 Ma). Aerobic …

The Nkout banded iron formations (BIFs)-hosted iron deposit is located in the Ntem Complex
at the northwestern part of the Congo craton, southern Cameroon. We report …