Argon data for samples from Sheep Creek and other mineral systems in central and western Montana, USA

This dataset includes 40Ar/39Ar data for 14 samples from the Sheep Creek carbonatite occurrence and other mineral systems in central and western Montana, USA. Samples were acquired from this area by Christopher Gammons and his students (Montana Technological University). Mineral separates of biotite and sericite from the samples were analyzed in the Denver Argon Geochronology Laboratory at the USGS from September, 2024 to November, 2024.