American Journal of Science

American Journal of Science Founded in 1818 by Benjamin Silliman. The Journal is devoted to geology and related sciences. www.ajsonline.org
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https://ajs.manuscriptmanager.net/ The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scientists in academia and government institutions. The American Journal of Science considers contributions from any field within the Earth Sciences, however the papers are expected to be of interest to a broad cross section of the scientific community. Consequently, manuscripts more appropriate for regional or specialty journals are often returned to authors without external review. AJS would like to increase its visibility in the broad field of Earth System History that would address the following three broad areas:
1. The coupling of the solid earth, ocean and atmospheric systems through time
2. The relationships and feedbacks between tectonics and climate
3. Deep time coupling of biology to the chemical evolution of Earth
AJS strives to publish papers with maximum impact in their fields. There are no limits on the minimum or maximum sizes of submitted manuscripts.

New Paper: Duricrust Diagenesis in the Kalahari Basin With Implications for Mineral Recycling and the Long-Term Resilien...
09/29/2026

New Paper: Duricrust Diagenesis in the Kalahari Basin With Implications for Mineral Recycling and the Long-Term Resilience of Cratonic Landscapes by Shlomy Vainer, Ari Matmon, Alan Hidy, Mike de Wit, Valérie Chavagnac, ASTER Team, Torsten W. Vennemann, Claudia Baumgartner, Eric P. Verrecchia
Am J Sci 2026; 326:13 https://doi.org/10.2475/001c.168523

“Southern African calcrete-cilcrete duricrusts record the interplay of tectonic structure, landscape evolution, and hydrological connections across the Kalahari Basin.”

New Paper: Plio-Pleistocene Stratigraphy, Paleoenvironments, and Isotope-Derived Water Temperatures at Beeline Quarry, O...
09/17/2026

New Paper: Plio-Pleistocene Stratigraphy, Paleoenvironments, and Isotope-Derived Water Temperatures at Beeline Quarry, Orange County, Florida, U.S.A. by Lucas D. Gomes, Sierra V. Petersen, Roger W. Portell, Eric Waters, Yunhan Fang

Am J Sci 2026; 326:12 https://doi.org/10.2475/001c.167511

“Carbonate clumped isotope thermometry reveals surprisingly cool water temperatures on the Florida Platform during two Pleistocene highstands and highlights the hydrologic complexity of ancient coastal systems.”

New Paper: Thrombolite Genesis Under Dynamic Hydrocarbon Fluid Flux: Microbial Records From New Zealand Paleo-Seeps by R...
09/17/2026

New Paper: Thrombolite Genesis Under Dynamic Hydrocarbon Fluid Flux: Microbial Records From New Zealand Paleo-Seeps by Richard Schinteie, Kathleen A. Campbell, Steven D. Hood, Daniel Birgel, Melissa J. Troup, Jörn Peckmann, Jens Greinert, and Campbell S. Nelson

Am J Sci 2026; 326:11 https://doi.org/10.2475/001c.166129

“Miocene seep carbonates from New Zealand preserve thrombolites encased in fibrous aragonite cements, recording variable hydrocarbon flux, redox‑stratified microbial communities, and neomorphic aragonite–calcite diagenesis.”

New Paper: Hydrogen Isotope Exchange in Clay Mineral–Water Systems: Geochemical Insights From an Improved Kinetic Model ...
09/08/2026

New Paper: Hydrogen Isotope Exchange in Clay Mineral–Water Systems: Geochemical Insights From an Improved Kinetic Model by Jonathan D. Smolen, Arkadiusz Derkowski, Christopher A. Sparacio, and Michael T. Hren

Am J Sci 2026; 326:10 https://doi.org/10.2475/001c.164723

“Smolen et al. present experimental evidence to show clay minerals exchange hydrogen isotopes with water via a unique “hopping” mechanism and introduce a new kinetic model to improve geological extrapolations.”

New Paper: Detrital Zircon Provenance of Cambro-Ordovician Inliers in the Northern Maine Appalachians: Relocating the La...
09/04/2026

New Paper: Detrital Zircon Provenance of Cambro-Ordovician Inliers in the Northern Maine Appalachians: Relocating the Laurentia–Ganderia Boundary in an Accretionary Orogen by Chunzeng Wang, John W. F. Waldron, Allan Ludman, Amber T. H. Whittaker, Robert G. Marvinney, and Paul O’Sullivan
Am J Sci 2026; 326:9 https://doi.org/10.2475/001c.164826

New Paper: Facies Vectors: Disentangling Environmental Variability, Diagenesis, and Secular Change in Carbonate Stratigr...
06/08/2026

New Paper: Facies Vectors: Disentangling Environmental Variability, Diagenesis, and Secular Change in Carbonate Stratigraphies by Ryan A. Manzuk, Matthew D. Nadeau, Clare Mate, Sarah M. Jacquet, and Adam C. Maloof

Am J Sci 2026; 326:8 https://doi.org/10.2475/001c.161588

“We represent each sampled point in a lower Cambrian section as a vector of data collected through field observations, computational image analyses, and geochemical measurements to formally test the null hypothesis of stratigraphic stasis.”

New Paper: Reversed Inter-Mineral Fe-Zn Isotope Fractionation in Ophiolitic Peridotites: Evidence for Widespread Hydrati...
04/22/2026

New Paper: Reversed Inter-Mineral Fe-Zn Isotope Fractionation in Ophiolitic Peridotites: Evidence for Widespread Hydration of Oceanic Lithospheric Mantle by Ben-Xun Su, Yan Xiao, Jing Wang, Qi-Qi Pan, and Shou-Qian Zhao
Am J Sci 2026; 326:7 https://doi.org/10.2475/001c.160209

“Fluid-assisted element exchange and subsolidus diffusion in various lithologies of the oceanic lithospheric mantle produce reversed inter-mineral isotope fractionation.”

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