Robuta

https://conservancy.umn.edu/items/572bf574-64e7-4309-9177-d25545090af9 Geologic and geochemical attributes of the Beaver River Diabase and Greenstone Flow: Testing a... Over the last century, numerous geological studies have reasonably resolved the overall tectonomagmatic evolution of the 1.1 Ga Midcontinent Rift (MCR). The... the beaver river https://www.usgs.gov/publications/beaver-river-structure-a-cross-strike-discontinuity-possible-crustal-dimensions The Beaver River structure: A cross-strike discontinuity of possible crustal dimensions in the... A significant cross-strike structural discontinuity, the Beaver River Structure, has been recognized near the boundary between the north-central part of the... the beaver river