In sediment cores taken in 2000, the researchers found hydrocarbons at depths of 2 to 11 inches.

Indeed, sediment cores show a 3.5 fold increase in phosphorus concentration over the past century.

In 2003, an archaeologist examining sediment cores found pollen from coconut palms deep below the bottom of the central lagoon.

Over the following days the team collected water samples and also sediment cores from the lake bottom.

It has been detected in sediment cores from the bottom of the Great Blue Hole.

Longer and deeper sediment cores are expected in the near future.

The new "proxy" used in this sediment core obtained both a continental and a sea surface temperature record.

Kaikō also collected sediment cores containing marine organisms from the bottom of the deep.

The main task of the expedition was to take up to 20 m long sediment cores from the ocean floor.

Between February and March 2000, scientists collected sediment cores 5 to 6 m in length from the ocean floor.