Burnt layer explained

A burnt layer or burned layer in archaeology is a stratum of earth that was formed primarily by the burning of objects or buildings. The extent of the layer is irrelevant. It can be the remains of a campfire as well as the remains of a burned down settlement.

Burnt layers are recorded in event stratigraphy, a sub-area of stratigraphy.^[1]

Notes and References

1. http://quaternary.stratigraphy.org/stratigraphic-guide/event-stratigraphy/#:~:text=Event%20stratigraphy%20comprises%20the%20study,depositional%2C%20erosional%20or%20geochemical%20features. Event stratigraphy