Brad S. Singer

TL;DR: In this paper, the ages of Eocene lake basins in the Laramide Rocky Mountain region were determined by using laser fusion and incremental heating techniques to differentiate inheritance, 40Ar loss, and 39Ar recoil.

TL;DR: The Tholeiitic Index (THI) as mentioned in this paper is a quantitative measure for the way in which a magma evolves, which measures the enrichment in Fe during the evolution from basalts to andesites.

TL;DR: In this paper, the authors present a synthesis of 0-5 Ma paleomagnetic directional data collected from 17 different locations under the collaborative Time Averaged geomagnetic Field Initiative (TAFI) when combined with regional compilations from the northwest United States, the southwest United States and Japan, New Zealand, Hawaii, Mexico, South Pacific, and the Indian Ocean, a data set of over 2000 sites with high quality, stable polarity, and declination and inclination measurements.

TL;DR: In this paper, the 4 0 Ar/3 9 Ar isochron ages of three lavas that overlie till 90 km east of the Cordillera at Lago Buenos Aires, and another 120 km from the Andes along Rio Gallegos at 51.8 °S that underlies till, strongly suggest that the ice cap reached its greatest eastward extent ca. 1100 ka.

TL;DR: The Geomagnetic Instability Time Scale (GITS) as discussed by the authors is based on direct dating of transitional polarity states in lava flows using the 40Ar/39Ar method, in parallel with astrochronologic age models of marine sediments in which oxygen isotope and magnetic records have been obtained.