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palaeolake
palaeolake n. 
/ˈpeɪlɪə(ʊ)leɪk/, /ˈpeɪlioʊˌleɪk/ Geology (the basin of) a lake that existed at some time in the past.
Brit. /ˈpalɪə(ʊ)leɪk/
, /ˈpalɪə(ʊ)leɪk//ˈpeɪlɪə(ʊ)leɪk/U.S. /ˈpeɪliəˌleɪk/
, /ˈpeɪliəˌleɪk//ˈpeɪlioʊˌleɪk/ΚΠ
1971 Science 15 Jan. 3967 Meltwater flowed into the depression, depositing units 1 and 2 in a cool, oligotrophic lake, here called Paleolake Seibold.
1992 S. S. Hall Mapping Next Millennium (1993) v. 117 Lake Chad, one of these so-called paleolakes, covered as much area as the present-day Caspian Sea.
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