core sample

The last task at Station 2 was to take a core sample.

This summer, 3,000 core samples will be taken from the river's bottom.

Then the core sample was taken from inside the crater.

He wondered again about the lack of water in the core samples.

And he worked once on a glacier, taking core samples.

They had studied core samples collected at the site in the 1970s.

Core sample in general from ocean floor, rocks and ice.

There is also some uncertainty as to why a core sample could not be obtained.

Time saved not going there would be spent on pulling out the deep core sample.

The equipment they used for boring core samples was in operation.