All that nature can never do, part VIII: sedimentary structures
Article published on 8 June 2008

by Irna

A few examples of what Mr. Osmanagic would probably call "artifacts...

"Mud-cracks"

Southwestern Virginia, USA
Lac du Salagou, Hérault, France
St. George, Utah, USA
Klingenthal, Vosges, France
Newfoundland, Canada

"Flute casts", "groove marks", "tool marks" and "load casts"

Load cast, Cheshmehanarak, Iran
Flute cast, Nord-Est Iran
Flute cast, Kadkan, Iran
Flute cast, Tafilalt, Maroc
Groove mark, Surenenpass, Suisse
Groove mark, Rudawka Rymanowska, Pologne
Tool mark, Liscomb Island, Canada
Flute casts, Gaspe Peninsula, Quebec, Canada
Flute casts, Gaspe Peninsula, Quebec, Canada
Flute casts, Salton Trough, southern California

"Molds", imprints from concretions or crystals

Nova Scotia, Canada
Empreinte de cristaux dans du grès, France
Jaizkibel, pays basque, Espagne