From Wikipedia:

Lithification is a process of porosity destruction through compaction and cementation. Lithification includes all the processes which convert unconsolidated sediments into sedimentary rocks. Petrification, though often used as a synonym, is more specifically used to describe the replacement of organic material by silica in the formation of fossils. In geology consolidation is a synonym for lithification.

A library of simple diagrams of geological processes.

The aesthetics of striation as a result of lithification.

The aesthetics of tafoni as a result of erosion.

Modelling of compaction (packing) (also, lithification) through computation.

-dn

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