REKONSTRUKSI HUTAN KAWASAN KARST GUNUNGSEWU DAERAH ISTIMEWA YOGYAKARTA, INDONESIA by , Lies Rahayu Wijayanti Faida, Ir.,MP., , Prof. Dr. Sutikno

“…Age of pollen deposition layer is expressed by BP (Before the Present).Statement of age by BP is commonly used in studying the history of the earth, and is internationally adopted in 1950 as a starting point/point zero. …”