"Typical" vibracores - example |
0-12 in. Interval: oily soft silt. Consistency varies from almost fluid (left) to gelatinous (right). Despite vibrations, gas bubble cavities are still preserved in the interior. A bluish sheen in places indicates the presence of oil. |
11-25 in. Interval: oily firmer silt. Consistency is like pudding. Some evidence of layering is seen. More bubble voids and bluish oil sheen are visible. |
24_38 in. Interval: oily silt with clay band. Consistency is like pudding to soft dough. Below the darker gray band at 20 in. is a light brown band of soft silty clay with oil traces. |
This 9-ft. core provides a good example of both polluted and natural sediments of various types. It was collected from a reservoir in Michigan, USA as part of a contaminant study. The core was photographed at overlapping intervals with a track-mounted camera on a table top under artificial lights. A descriptive core log was also made. |
AScI Corporation |
