Recent Advances and Current Research Issues in Lunar Stratigraphy

abstract additional ages Apollo candidate channel Clementine consistent crater crater size-frequency crust crustal thickness dark degradation deposits depth derived determined diameter distribution early ejecta emplacement Eratosthenian eruption et al event Figure floor formation formed Geologic Map Geophysical Research Head Hiesinger highlands Houston identified images Imbrian Imbrium impact basins impact craters indicate Journal of Geophysical larger lava flows Lunar and Planetary Lunar Reconnaissance Orbiter mantle mare basalts Mare Imbrium material measurements melt model ages Moon named nearside Neukum observed older Orbiter origin Pieters plains Planetary Institute Planetary Science Conference plateau possible previously primary rille Procellarum QCDs region relative revealed rille ring samples scale Schrödinger basin Schultz scores secondary South Pole–Aitken basin Space spectral Spudis stratigraphy structure suggest surface Table terrains Texas tion topographic U.S. Geological Survey units volcanic wall Wilhelms younger