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And some studies in glacial sediments and lakes below the ice suggest they may have vanished in the early Holocene, only to reform again about 3,000 years ago. And to get a better picture, researchers tested samples of boulders and recently exposed bedrock from nearly four retreating glaciers in and around Yosemite National Park. And they're looking for particular variations of carbon and the aloe vibrileum that form only when the cosmic rays from the sun hit the rock. Drop it.