Geologists recently dated the age of Watersmeet gneiss, a type of rock in the Upper Peninsula, as the oldest in the U.S. Here ...

A Southwest Research Institute-led team updated planetary bombardment models with the latest geologic information and then applied those models to understand how impacts may have affected oxygen l ...

MUCH has been written in recent years regarding the geology and natural history ... including the Archean crystalline rocks, and the Carboniferous, Cretaceous, Tertiary, and Post-Tertiary formations.

(1987) Development of the Archean crust in the Medina ... Wyoming. Journal of Geology, 97, 331-342. Grant, J. A., and Frost, B. R. (1990) Contact metamorphism and partial melting of pelitic rocks in ...

To date, such features are not observed in Archean rocks, which suggests (but does ... on ocean chemistry and input fluxes. Chemical Geology 217, 113–126 (2005). Lowe, D. R.