AARP Hearing Center
This unique geological formation is located approximately 18 miles east of Butte and north of I-90. The rocks in this unique geologic area chime when tapped lightly with a hammer. It is believed that the ringing is a combination of the composition of the rock and the way the joining patterns have developed as the rocks have eroded away, if a boulder is removed from the pile, it doesn't ring. Please don't disturb this natural phenomenon!
Monday, Jan 19, 2026 at 11:00 a.m. ET
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Online Event
Monday, Jan 26, 2026 at 11:00 a.m. ET
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Monday, Feb 2, 2026 at 11:00 a.m. ET
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Online Event