An earthquake near a Neolithic culture at Sotira in Cyprus destroys much of the local infrastructure.
Ubaid period came to an abrupt end in eastern Arabia and the Oman peninsula at 3800 BC.
In Syria, mass graves at Tell Brak, dating from ca. 3800 to 3600 BC, have been unearthed, suggesting advanced warfare around this period.
3800–3200 BC – 120 Wedge tombs (Ireland)
c. 3750 BC – origins of Proto-Semitic language
3760 BC – first year of the Hebrew calendar
3700 BC – Oldest known door in Europe (Zurich, Switzerland)
3700–2300 BC – Long barrow tombs in England
See: Human Era/Holocene epoch
25th of Elul, 3761 BC (and before) — Considered the first day of creation from formless matter (Gen. 1.2), traditionally interpreted as out of nothing, on which the Bible recalls that God created existence, time, matter, darkness and light.
1st of Tishrei, 3761 BC — Considered the sixth day of creation (Rosh Hashanah Day 1), on which the Bible recalls that God created Adam and Eve.
38th century BC Wikipedia