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This is called the "Devil's Slide". Devil's Slide is an unusual geological formation located in northern Utah's Weber Canyon, near the community of Croydon in Morgan County, Utah, USA. The slide consists of two parallel limestone strata that have been tilted to lie vertical, protruding 40 feet (12 m) out of the mountainside. Intervening layers have eroded more quickly, forming a channel some 25 feet (7.6 m) wide running hundreds of feet down the mountain.
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The sides of the slide are hard, weather-resistant limestone layers about 40 feet high, 25 feet apart, and several hundred feet in length. In between these two hard layers is a shaly limestone that is slightly different in composition from the outer limestone layers. This middle layer is softer, which makes it more susceptible to weathering and erosion, thus forming the chute of the slide.
Looking like a large playground slide fit only for the Devil, this site is a tilted remnant of sediments deposited in a sea that occupied Utah’s distant geologic past. Approximately 170 to 180 million years ago, a shallow sea originating from the north spread south and east over areas of what are now Montana, Wyoming, and Utah. This sea extended as far east as the present-day Colorado River and south into northern Arizona.
Located on Interstate 82. Text from USGS Logan, Utah.
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