1.   And sediment samples from tidal flats have already been taken.

2.   Minnows and tiny clams were placed in tanks with sediment samples and clean salt water.

3.   Some sediment samples taken nearby have shown elevated levels of pesticides.

4.   That means the fish are concentrated where MMS sediment samples indicate mercury levels may be highest.

5.   The official, Michael Musngi, said a more recent study by a Japanese company found a high concentration of heavy metals in sediment samples taken from Subic Bay.

6.   Their sediment samples were rich with crushed fresh-water shells, bleached by the sun when they had covered the original beaches.

7.   In the cool twilight of a cave once home to prehistoric humans, biologist Stephen Weiner ran a sediment sample the size of a pinhead through an infrared spectrometer.