Sentences with phrase «very ancient samples»

Not exact matches

By employing a technique they developed that involves collecting methane from roughly ten thousand gallons of seawater per sample, they made a surprising discovery: ancient - sourced methane is indeed being released into the ocean; but very little survives to be emitted to the atmosphere, even at surprisingly shallow depths.

Future missions must either find surface regions where erosion from wind - blown sand has recently exposed very ancient material, or alternately samples must be obtained from a shielded region beneath the surface.

But until now, conclusive results have been limited by the very small sample size of ancient quasars.»

Stable isotope results show only very slight differences between ancient and modern whales, indicating the hypothesis of population substructure in the past around the area of the Olympic peninsula / Vancouver Island remains a possibility and warrants further investigation using larger sample sizes.