Craquelure
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Craquelure is a fine pattern of dense cracking formed on the surface of materials. It can be a result of drying, shock, aging, intentional patterning, or a combination of all four. The term is most of
Craquelure in the Mona Lisa, with a typical "Italian" pattern of small rectangular blocks
Age craquelure in pottery
Typical French craquelure in a portrait from c. 1750, larger and less regular patterns, with curving cracks
Dried and cracked mud masses.
Mudcrack
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Mudcracks are sedimentary structures formed as muddy sediment dries and contracts. Crack formation also occurs in clay-bearing soils as a result of a reduction in water content.
Craquelure
…Patina Mudcrack Bucklow, Spike, "A Stylometric Analysis of Craquelure", Computers and the Humanities, Vol. 31, No. 6 (1997/1998), pp. 503–521, Springer, JSTOR…
Fresh mudcracks on the shore of The Wash, England
Top layer shrinks and curls up due to the strain
Crack pattern in clay exposed to the air
Ancient mudcracks preserved on the base of a bed of sandstone