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Old Rock Day

Nature · Fun · January 7

Old Rock Day looks at the ancient stones underfoot, from fossils and river pebbles to the layered cliffs that record Earth's long history.

Old Rock Day falls on Thursday, January 7, 2027. That is 72 days away.

A rock on the sidewalk can be far older than any city, language or tree around it. Old Rock Day turns attention to that quiet age, and to the stones, fossils and layered cliffs that hold it.

Geologists sort rocks into three broad families. Igneous rocks, like granite and basalt, form when molten rock cools. Sedimentary rocks, like sandstone and limestone, build up from layers of sand, mud and shells pressed together. Metamorphic rocks, like marble and slate, are older rocks changed by heat and pressure deep underground. Each kind carries clues about where it came from, and sedimentary layers are where most fossils turn up.

You do not need a hammer or a field guide to start noticing. A road cut shows stripes of different layers. A creek bed sorts pebbles by size and polish. Old buildings, gravestones and kitchen counters are often made of stone with a story of its own, and a close look can reveal crystals, specks of mica or the faint outline of a shell.

People mark the day by walking somewhere rocky, visiting a natural history museum, or finally sorting the jar of beach stones that has sat on a windowsill for years. Kids tend to be natural collectors, and a pocketful of rocks is a fine start.

If you take a rock home, check local rules first, since many parks ask visitors to leave stones where they are. A photograph keeps the stripes and sparkle just as well, and the rock stays put for the next person.

Ways to celebrate

• Look for rock layers in a road cut or creek bank.
• Visit a natural history museum's rock and fossil displays.
• Sort a jar of collected stones by color or texture.
• Photograph an interesting rock instead of taking it from a park.
• Try identifying the stone used in an old local building.

Dates

All national days on January 7

Also on January 7

• National Tempura Day
• National Bobblehead Day

Categories: Nature daysFun days