1.   They sank a drill in the exact center of the magnetic field to get a core sample for study.

2.   Micropalaeontological studies on recovered core samples have been used for stratigraphical studies on behalf of petroleum exploration companies.

3.   Analysis of core samples yielded chemical evidence that archaeologists said were consistent with the interpretation that the site was once occupied by people.

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

5.   Assays, which involve testing core samples to determine the presence and quantity of minerals are underway, the company said in a statement.

6.   At the Venezuelan mine project, owned by Placer Dome of Vancouver, a geologist inspected a core sample as drilling continued behind him.

7.   Back at his apartment in Venice, he displayed a long, clear plastic tube filled with a deep core sample recently taken from below the walkway area.

8.   A Columbia University study based on core samples taken from the ocean floor shows the planet warms and cools in abrupt and significant natural cycles.

9.   A report by Toronto-based Strathcona Mineral Services Ltd. determined Busang was a massive and lengthy fraud carried out by inserting gold into crushed core samples.