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Encountering 'Magic Rocks Beaches' on Oregon Coast: Science of Why

Published 10/01/21 at 5:56 AM PDT
By Oregon Coast Beach Connection staff

Encountering 'Magic Rocks Beaches' on Oregon Coast: Science of Why

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(Oregon Coast) – Nothing short of odd and yet delightful, it's also one of the Oregon coast's more surprising discoveries. You're walking along one of only a handful of beaches, and you hear an unusual and sometimes rather loud clacking, clicking noise from the rocks. The tide is rushing in and out, and knocking around layers of rounded, polished stones , creating a kooky chattering sound that's enchanting as well as a tiny bit creepy. (Above: Falcon Cove)

It's been nicknamed “magic rocks,” or at least one beach that features the noise has been nicknamed “Magic Rocks Beach.” The tide gives these rocks a kind of new life, turning inanimate objects into little chattering creatures. They rattle and shake in the moving water, conjuring images of a giant Mexican jumping bean or something odd and whimsical in that direction.

Such talking beaches only occur in a few places on the Oregon coast, and some more prominently than others. The three biggest progenitors of this are at the little town of Capes Meares on the Bayocean Spit, Cobble Beach at Newport's Yaquina Head, and the Falcon Cove beach near the Arch Cape tunnel. The latter has been nicknamed Magic Rocks Beach by locals. These places are the loudest and most obvious – at least on the northern half of the coastline.

The prerequisite is those masses of rounded, surf-polished cobblestones that exist in massive layers at the three beaches listed, but you can hear this to varying degrees at other beaches where such cobblestones are lying around at the tideline in thinner layers, such as at Oceanside (found in the video here), or at Arch Cape.

At the big three, the sound is almost continuous if the tide is reaching the rocks. If the tide is doing so at Magic Rocks Beach, then stay off the layers of cobblestones – this is one of the most dangerous beaches on the Oregon coast. Stay away from the area completely during big winter storms: a family lost their lives here a few winters back.

Tides touch the rocks here a little more than 50 percent of the time, but you can stand back at the access – from afar – and take in the wacky little aural spectacle from a distance. In fact, this area is rather difficult to walk on and utterly annoying to do so if the rock levels are quite high.

At Newport's Yaquina Head, it does it almost all the time. Plus, you have the added bonus of those rather stark, black rocks – proof they're eroded bits from the ancient lava (basalt) of the headland. The place is also covered in enormous and coarse grains of black sand, a truly unique spot on the Oregon coast.

The tiny village of Cape Meares also makes this sound, but again stay away from that noise because it means the tides are strong enough to come up onto the area where the cobblestones are. There are many places where the beach is not wide enough to let you run away from sneaker waves. However, plenty of spots let you listen and watch at a distance – stick to those. You'll be rewarded by probably the loudest of the magic rocks beaches you'll ever encounter.

According to Seaside geologist Tom Horning, such stones come from the walls of nearby headlands. This explains why most magic rocks beaches are next to this kind of formation. Thus, they carry the same elements and colors as what's around them.

How big one of these stones is dictates what kinds of noises it makes and how loud it is.

“The size of the rock is an indicator of the energy of the water and size availability of the rock in the first place,” Horning said.

After they fall from headlands, the tides and currents move them around.

“As the rocks are transported along, they jostle and grind against each other, becoming rounded," he said. It takes only a few months in the surf to round most rocks. Some rocks come from source areas (cliffs and mountainsides) where fractures are abundant. They start as fractured rock and can fall apart quickly in the surf, forming small rocks. Other rocks begin as large, unfractured stone, so they resist breaking apart to smaller pieces, leaving a deposit of large boulders. Nature takes what is available and makes what is possible.”

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