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
Science Documentaries That Inspire: A Curated Collection for Enthusiasts
A handful of titles stand out in the world of science documentaries for their ability to both educate…
Cyclone Freddy was the most energetic storm on record. Is it a harbinger of things to come?
NOAA / AP Thomas Mortlock, UNSW Sydney On February 4, a storm off the north-west coast of Australia…
A monster eddy current is spinning into existence off the coast of Sydney. Will it bring a new marine heatwave?
Shutterstock Moninya Roughan, UNSW Sydney; Amandine Schaeffer, UNSW Sydney; Junde Li, and Shane Keating, UNSW Sydney Right now,…
Scouring South Africa For Fossils (Older Than Dinosaurs)
It is not immediately apparent to us as readers of paleontology updates, but these ancient animals are often…