Vol. 320, Issue 8, 2020

Science Paper
Miocene to Pleistocene Glacial History of West Antarctica Inferred From Nunatak Geomorphology and Cosmogenic-Nuclide Measurements on Bedrock Surfaces
Perry SpectorJohn StoneGreg BalcoTrevor HillebrandMika ThompsonTaryn Black
We report geomorphic observations and cosmogenic-nuclide measurements on bedrock surfaces from three isolated nunatak groups in West Antarctica: the Pirrit Hills and Nash Hills, located in the Weddell Sea sector,...
Science Paper
Zircon U-Pb Geochronology and Nd-Pb Isotope Geochemistry of Blue Ridge Basement in the Eastern Great Smoky Mountains, U.S.A.: Implications for the Proterozoic Tectonic Evolution of the Southeastern Laurentian Margin
D.P. MoecherF.C. HarrisE.A. LarkinR.J. QuinnK.B. WalshD.F. LoughryE.D. AndersonS.D. SamsonA.M. SatkoskiE. Tohver
The Mesoproterozoic to Paleozoic history of the southeastern Laurentian margin involved repeated collisional and accretionary tectonomagmatic events that reworked and recycled older continental crust of preceding events. The Great Smoky...
Science Paper
Redox Constraints on a Cenozoic Imbalance in the Organic Carbon Cycle
Matthieu E. Galvez
Over geological timescales, variations in atmospheric O2 are typically attributed to the imbalance between the weathering of organic carbon (OC) and reduced sulfur on land, the major sink terms for...