 <unk> dating of the remains suggested Early Neolithic activity began at the site during <unk> – <unk> <unk> BCE ( 95 % probability ) or <unk> – <unk> cal BCE ( 68 % probability ) , when the first human remains were buried at the site . It then suggested that after an interval of either 60 – 350 years ( 95 % probability ) or 140 – 290 years ( 68 % probability ) , further <unk> of human remains were made inside the tomb . This second phase probably began in <unk> – <unk> cal BCE ( 95 % probability ) or <unk> – <unk> cal BCE ( 68 % probability ) . The <unk> dating of the human remains does not provide a date for the construction of Coldrum Long Barrow itself ; it is possible that the individuals died either some time before or after the monument 's construction . 
