Patterns arise during the consolidation process forming flow and depositional patterns in the original silica rich sediment or volcanic ash.

It also occurs in novaculites and in iron and phosphorus rich sediments.

The rich sediment of the marsh attracted farmers.

In north Australia, monsoon rains flush rich sediment into the ocean.

Silt your blood with rich French sediment so you'll see with native eyes!

Sapropels are dark organic rich marine sediments that contain greater than 2% organic carbon by weight.

Under anoxic circumstances, however, organic material cannot decay and becomes a dark sediment, rich in organic material.

Then came a layer of sand and the surface layer, the rich sediment.

South east of this is a metamorphosed belt of dolomite rich sediments correlated with the Oonah Formation.

Torrential seasonal rains also drain from the Mandara Mountains, bringing a rich sediment.