2 Feb 2012 impact basins: Stratigraphy, sequence and ages from superposed impact crater populations raphy of the Moon by the Lunar Orbiter Laser Altimeter . to a traditional (unbuffered) count area definition. The dif- . Schematic diagram illustrating the buffered crater-counting used to count craters to date basin.
Keywords: early Earth, accretion, planetesimals, giant impacts, Moon, Hadean, mantle plumes, plate tectonics, geological time-scale, age dating . It has long been recognized that rock sequences represent a progressive superposition of . maintain the Hadean as presently defined (“no preserved rock record”), or to
16 Nov 2010 Lunar Impact Basins are the most important landforms on the Moon. Some impact basins are well defined by multiple rings, central km on each basin to determine a superposed crater density expressed Only a few basin ages have been determined by dating of sample collected by Apollo astronauts.