The clay sediments were laid down at the time of the mass extinction.

Geologists, on the other hand, support Nieuwenkamp's view, pointing out clay sediments found near the site.

On the bed of the historic lake, the prevailing silt and volcanic clay sediments amplify seismic shaking.

As a powder associated with gypsum within clay sediments, no more than three centimeters below the surface in areas of bat guano deposits.

Later the lake was filled with clay sediments which are up to 20 metres thick in some places.

At the depths of the gyre lies a sea floor of fine-grained clay sediments.

The mineral occurs mainly in metamorphosed clay rich sediments and felsic igneous rocks.

These clay sediments are locally overlain by peat deposits forming raised mires.

It is the light colored clay sediment forming the playa surface surrounding the dark grey Grandstand that creates its prominence.

It is a rock-bottomed highland river, containing clay sediments.