description Glasford Overview
Glasford is a probable buried meteorite impact structure near Glasford in Peoria County, Illinois. Geological drilling and gravity surveys identified a roughly circular dome about 4 kilometres across, underlain by intensely shattered breccia and overlain by Paleozoic sedimentary rocks. The structure is associated with the Late Ordovician Maquoketa Group, and shatter cones found in drill cores strengthen the interpretation that the brecciation was caused by impact rather than ordinary tectonic deformation. It is relevant to geologists studying buried impact structures and the Ordovician impact record.
help Glasford FAQ
What is the Glasford crater?
Glasford is a probable buried meteorite impact structure near Glasford in Peoria County, Illinois. It is hidden beneath younger sedimentary rocks rather than appearing as a clear surface crater.
How large is the Glasford impact structure?
Geological drilling and gravity surveys identified a roughly circular dome about 4 kilometres across. The structure is also marked by intensely shattered breccia beneath Paleozoic sedimentary rocks.
How was the Glasford crater identified?
Researchers used geological drilling and gravity surveys to detect the buried circular structure. The shattered breccia provided additional evidence consistent with an impact origin.
Can visitors see a large crater at Glasford?
Not in the way visitors can see an exposed crater, because Glasford is buried. Its evidence comes from subsurface geology, including the dome, shattered rock, and overlying Paleozoic strata.
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