November 13, 2007 - Moeraki Boulders, round septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

Mudstone Hill Farmland, King Country, North Island, New Zealand, Pacific

Mudstone Hill Farmland, King Country, North Island, New Zealand, Pacific

Eroded mudstone at Zabriskie Point, Death Valley National Park, California.