The study on benthic foraminifera was conducted from 8 to 9 April 2011 in Dumai marine waters. This study aims to observe the relationship between benthic foraminifera with a high content of crude oil in marine sediment cores in Dumai. The method used in the field was survey method. The samples were taken from 12 cm depth and divided into five layers from the surface of the sample at a dep…