[Rockhounds] Ohio Celestine cave

[pmodreski]

Linda, it's a little more complicated than this. The Earth's crust in North America was bent down where the mass of ice was greatest  but it also acted like stepping on one end of a plank, like a see-saw; the other end went up. So now,  with the ice having melted, the center beneath the greatest ice thickness rebounds upward, but the fringes bend back down. There is a "hinge line", north of which the land is ri a ingredient, but south of which  dropping. The Hinge Line runs through the Great Lakes region  so that the land around most of Lake Superior (and Lake Ontario) is rising  but most of lakes Michigan, Huron, and Erie are falling. The center of rebound is around Hudson Bay; the Hinge Line runs near Duluth. So in effect the lakes are tilting southward; shorelines advancing to the south, but receding on the north sides.PeteSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: linda at middleearthminerals.com Date: 7/28/22  3:26 PM  (GMT-05:00) To: "'Rockhounds at drizzle.com: A mailing list for rock and gem collectors'" <rockhounds at rockhounds.drizzle.com> Subject: Re: [Rockhounds] Ohio Celestine cave I have heard that all the Great Lakes are still rebounding from the weight of ice that covered and depressed them during the latest ice ages.  This leads to receding shorelines that tend to make people believe the lakes are shrinking.Linda St-Cyr-----Original Message-----From: Rockhounds <rockhounds-bounces at rockhounds.drizzle.com> On Behalf Of Johan MaertensSent: Thursday, July 28, 2022 4:27 AMTo: rockhounds at rockhounds.drizzle.comSubject: [Rockhounds] Ohio Celestine cavePrior to meeting Steve Shimatzki at the Midwest Federation of Mineral societies at his club’s show in 2021, I visited the famous Celestine cave on South Bass Island, Ohio in Lake Erie. You can indeed walk through the small cave. It was enlarged and 140 tons of Celestine were removed and sold for industrial use. The experience is amazing. Giant Celestine crystals are all around you. The explanation by the bar tender aka tour guide is poor at best.It is not an ice age relic. What make me wonder is how the cave can be dry. The islands are comprised of karstic limestone. There are no Rivers or creeks on the islands. That is why the cave was found: digging a well. The cave may be just above the water level. The Heineman wines (the dry ones) are average at best. It is a double fun experience. There is a regular cave across the street. That is a cave with speleothems, no Celestine. Johan Maertens_______________________________________________Rockhounds mailing listSubscription Services:  http://rockhounds.drizzle.com/mailman/listinfo/rockhounds_rockhounds.drizzle.comList Usage Policy: http://Tomaszewski.net/Kreigh/Rockhounds/Rockhounds.shtml_______________________________________________Rockhounds mailing listSubscription Services:  http://rockhounds.drizzle.com/mailman/listinfo/rockhounds_rockhounds.drizzle.comList Usage Policy: http://Tomaszewski.net/Kreigh/Rockhounds/Rockhounds.shtml