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View article: Organic geochemical evidence for life in Archean rocks identified by pyrolysis–GC–MS and supervised machine learning
Organic geochemical evidence for life in Archean rocks identified by pyrolysis–GC–MS and supervised machine learning Open
Throughout Earth’s history, organic molecules from both abiogenic and biogenic sources have been buried in sedimentary rocks. Most of these organic molecules have been significantly altered by geologic processes through deep time. Nonethel…
View article: Deciphering the role of microbial influence in trace fossil diagenesis in sandstone (Ipu Formation, Silurian, Parnaíba Basin, Brazil)
Deciphering the role of microbial influence in trace fossil diagenesis in sandstone (Ipu Formation, Silurian, Parnaíba Basin, Brazil) Open
Microbial communities present in biofilms and microbial mats can modify and stabilise the substrates they colonise. Consequently, the preservation of trace fossils, resulting from the interaction of organisms with such substrates, can also…
View article: Microbial mats in dinosaur ichnocoenoses
Microbial mats in dinosaur ichnocoenoses Open
Until now, the significance of microbial mats in preservation of dinosaur tracks and in reconstructing the palaeoenvironment in which dinosaurs roamed was rarely studied. Dinosaur tracks are commonly found close to ancient aquatic bodies w…
View article: Interpreting an Archaean paleoenvironment through <scp>3D</scp> imagery of microbialites
Interpreting an Archaean paleoenvironment through <span>3D</span> imagery of microbialites Open
While stromatolites, and to a lesser extent thrombolites, have been extensively studied in order to unravel Precambrian (>539 Ma) biological evolution, studies of clastic‐dominated microbially induced sedimentary structures (MISS) are rela…
View article: Ratification of the base of the ICS Geological Time Scale: the Global Standard Stratigraphic Age (GSSA) for the Hadean lower boundary
Ratification of the base of the ICS Geological Time Scale: the Global Standard Stratigraphic Age (GSSA) for the Hadean lower boundary Open
The base of the ICS (International Commission on Stratigraphy) Geological Time Scale was ratified in 2022 by defining a new Global Stratigraphic Standard Age (GSSA) for the lower boundary of the Hadean Eon (formerly 4000–3600 Ma); the age …
View article: Evidence for metabolic diversity in Meso-Neoproterozoic stromatolites (Vazante Group, Brazil)
Evidence for metabolic diversity in Meso-Neoproterozoic stromatolites (Vazante Group, Brazil) Open
Deciphering the evolution of ecological interactions among the metabolic types during the early diversification of life on Earth is crucial for our understanding of the ancient biosphere. The stromatolites from the genus Conophyton cylindr…
View article: Surface Morphologies in a Mars-Analog Ca-Sulfate Salar, High Andes, Northern Chile
Surface Morphologies in a Mars-Analog Ca-Sulfate Salar, High Andes, Northern Chile Open
Salar de Pajonales, a Ca-sulfate salt flat in the Chilean High Andes, showcases the type of polyextreme environment recognized as one of the best terrestrial analogs for early Mars because of its aridity, high solar irradiance, salinity, a…
View article: Biofilm harvesters in coastal settings of the early Palaeozoic
Biofilm harvesters in coastal settings of the early Palaeozoic Open
The ichnogenera Syringomorpha and Daedalus are here interpreted as products of infaunal biofilm harvesters. This study investigated: (1) Syringomorpha nilssoni and Syringomorpha isp. from the Cambrian Series 2‐Miaolingian Campanario Formati…
View article: Microbially Induced Sedimentary Structures in Clastic Deposits: Implication for the Prospection for Fossil Life on Mars
Microbially Induced Sedimentary Structures in Clastic Deposits: Implication for the Prospection for Fossil Life on Mars Open
Abundant and well-preserved fossil microbenthos occurs in siliciclastic deposits of all Earth ages, from the early Archean to today. Studies in modern settings show how microbenthos responds to sediment dynamics by baffling and trapping, b…
View article: Microplastic fragment and fiber contamination of beach sediments from selected sites in Virginia and North Carolina, USA
Microplastic fragment and fiber contamination of beach sediments from selected sites in Virginia and North Carolina, USA Open
Microplastic particles (<5 mm) constitute a growing pollution problem within coastal environments. This study investigated the microplastic presence of estuarine and barrier island beaches in the states of Virginia and North Carolina, USA.…
View article: Volcanogenic Pseudo-Fossils from the ∼3.48 Ga Dresser Formation, Pilbara, Western Australia
Volcanogenic Pseudo-Fossils from the ∼3.48 Ga Dresser Formation, Pilbara, Western Australia Open
The ∼3.48 billion-year-old Dresser Formation, Pilbara Craton, Western Australia, is a key geological unit for the study of Earth's earliest life and the habitats it occupied. Here, we describe a new suite of spheroidal to lenticular micros…