Bolgoda sediments contain vascular plants and sapropels deposited at low rates.
Organic carbon contents increased dramatically at ca. 2.5 cal ky B.P.
This change was due to sea-level regression.
Reworked OMs and aquatic plants increased after ca. 2.5 cal ky B.P.
PAH contents rise from anthropogenic activity after European settlement in the 15th C.