History of Nomenclature
The term was introduced for large unflooded basins on the far side of the Moon by Lipskiy (1965) who analyzed Zond-3 photographs. Since all prominent basins are flooded by lava (mare) on the nearside, unflooded basins were first seen on the spacecraft images of the farside of the Moon. The term was originally coined by the Russian astronomer Yuri Pavlovich Pskovsky (Vasilyevich 2011) and was used only during the Soviet Moon Program (1965–1974). Thalassoid as a generic term was rejected in 1967 because these features were not distinguishable from other unflooded, ordinary basins (Perek 1968; Hartmann and Wood 1971), but the debate on thalassoids helped decouple the concept of basins from their lava fill (Hartman and Kuiper 1962; Hartmann 1981).
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