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Modeling the effects of differential scaling of impact melt and transient cavity volumes indicates that impact melt volumes exceed transient cavity volumes at transient cavity diameters greater than ∼500 km on the Earth. This condition is not realized on the Moon until transient cavity diameters are greater than ∼3000 km. A reasoned case is made that because of this “differential scaling,” the large impact “basins” comparable in size to such lunar basins as Orientale, which must have been formed on the Hadean Earth, did not have an Orientale-like form. While their exact form is unknown, they were likely shallow structures,...

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