Grenada was first populated by peoples from South America, possibly during the Caribbean Archaic Age, although definitive evidence is lacking. The earliest potential human presence comes from proxy evidence of lake cores, beginning ~3600 BC. Less ephemeral, permanent villages began around ~AD 100-200. The population peaked between AD 750–1250, with major changes in population afterwards, potentially the result of regional droughts and/or the "Carib Invasion", although the latter rests on highly circumstantial evidence.