The sinkhole where Pollard was believed to have fallen is in an area with limestone bedrock and had almost no ground left, state police said. The sinkhole likely appeared at some point Monday ...

Workers down here chipped away at the limestone bedrock to build what is thought to be the original burial chamber for King Khufu. Egyptologists believe the chamber is 'unfinished' because Khufu ...

Records of these conditions have been left behind in the layers of limestone and mudstone in local bedrock. The fossils that these layers contain are world-famous for the details that they record ...

Eroded from the thick limestone bedrock over hundreds of thousands of years, these karst features hint at the otherworldly caverns belowground. Sarawak Chamber, briefly illuminated by dozens of ...

Workers down here chipped away at the limestone bedrock to build what is thought to be the original burial chamber for King Khufu. Egyptologists believe the chamber is 'unfinished' because Khufu ...

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Their winter dens are subterranean caverns formed by the area's water-worn limestone bedrock. In the spring, the snakes come up to the pits where they engage in mating rituals. Then they disperse ...