Old Rock Day Jan. 7, 2026

Today is a day that puts time into perspective. Old Rock Day highlights the vast geological processes that have shaped our world since its earliest eras. In Arches National Park, Utah, Turret Arch—seen through North Window—offers a striking reminder: landscapes can take hundreds of millions of years to assemble. The Entrada Sandstone that forms these arches began as shifting dunes and shallow seas long before erosion carved today"s shapes. Even so, these formations are relatively young. Most rocks on Earth disappear over time because plate tectonics, erosion and volcanism continually recycle the crust. Only the planet"s ancient continental shields preserve truly old material. Canada"s Acasta Gneiss, about 4 billion years old, is the oldest known rock still rooted where it formed.

© Jim Patterson/TANDEM Stills + Motion

palette

Today in History

What the heck is a distaff?
Jan. 7, 2024Devils Marbles Conservation Reserve, Australia
Jan. 7, 2025Moeraki Boulders, South Island, New Zealand

More Desktop Wallpapers:

Sep. 2, 2025Camel thorn trees, Namib-Naukluft Park, Namibia
Mar. 23, 2026World Meteorological Day
Mar. 25, 2025Tolkien Reading Day
Mar. 3, 2025World Wildlife Day
Jun. 10, 2024The city of Osaka at night, Japan
Dec. 15, 2023SantaPark, Lapland, Finland
Aug. 12, 2024World Elephant Day
See-through cephalopod
Nov. 10, 2023Badlands National Park anniversary
Sep. 12, 2024World Dolphin Day
Jul. 17, 2024Rothenburg ob der Tauber, Bavaria, Germany
Nov. 5, 2024Lençóis Maranhenses National Park, Brazil
A time-worn medieval marvel
Mar. 10, 2025National Napping Day
Apr. 22, 2024Earth Day
Mar. 26, 2025Vancouver Cherry Blossom Festival
May 24, 2024Ordesa y Monte Perdido National Park
Oct. 23, 2024Madame Sherri Forest, New Hampshire, United States
Feb. 3, 2026Emerald Bay and Fannette Island, Lake Tahoe, California, United States
Will we be ready for the ‘big one?’
Jul. 9, 2024Talampaya National Park, Argentina
Feb. 2, 2025Groundhog Day
Jan. 5, 2024International Ice and Snow Sculpture Festival, Harbin, China
Behold the architectural marvel
Sep. 15, 2024Ouimet Canyon in the Ouimet Canyon Provincial Park
Feb. 9, 2024Pegadung Rock, Lampung, Sumatra, Indonesia
Nov. 14, 2025Manatee
Swinging over Munich
Starry, starry night
A street filled with sakura trees