However, this period is better attested at the Nagada site, thus it also is referred to as the Naqada I culture.[1] Black-topped pottery continued to be produced, but white cross-line pottery, a type which has been decorated with close parallel white lines being crossed by another set of close parallel white lines, begins to be produced during this time. The Amratian falls between S.D. 30 and 39 in Flinders Petrie's sequence dating system.[4][5]