Winemaker Gustav Heineman discovered the largest geode, filled with celestine crystals and measuring over 10 meters across, on South Bass Island, Ohio, in 1897. The geode formed during the Silurian period, around 430 million years ago, when glaciers melted at the end of the last ice age. Lake Erie water seeped into anhydrite pockets, dissolving them and creating caves.
Related Posts
Venice is sinking – we analysed every plan to save it, and none would preserve the city as we know it
Robert James Nicholls, University of East Anglia; Marjolijn Haasnoot, Utrecht University, and Piero Lionello, University of Salento Venice…
First wind, then rain. Next come the mozzies – here’s how to reduce your risk of bites and infections
Cameron Webb, University of Sydney While some parts of southeast Queensland and northern New South Wales are still…
This Cave Is a Musical Instrument
Luray Caverns in Virginia is home to the Great Stalacpipe Organ, a one-of-a-kind lithophone created by mathematician Leland…
‘Unprecedented’ climate extremes are everywhere. Our baselines for what’s normal will need to change
Thomas Rosenzweig/Shutterstock Milton Speer, University of Technology Sydney and Lance M Leslie, University of Technology Sydney Extreme temperature…