Indus

Formation and Collapse
This proto-culture formed 80,000 BCE on the southern Indus river. It was formed by homo sapiens descended from the initial group that migrated from the Arabian peninsula 170,000 BCE. It collapsed by 70,000 BCE due to the environmental disasters caused by the Toba super volcano eruption.

Distinguishing Features
The population here and all others than thus decend from them have developed a dominant gene that causes the hands and feet, including the Palms, soles, wrists and ankles to be much darker than the rest of the body.

Effects
Survivors of the collapse that migrated into the Deccan plateau and formed the Deccan proto-culture in 19,000 BCE