ANCIENT Fossil Horn Coral Reef Sea Life Mineral Specimen BLACK HILLS S. Dakota

Description: This specimen weighs 26.78 grams. It measures 33 mm x 31 mm x 21 mm. I offer a shipping discount for customers who combine their payments for multiple purchases into one payment! The discount is regular shipping price for the first item and just 50 cents for each additional item! To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart. Auctions you win are added to your cart automatically. For any "buy it now" items or second chance offers, be sure to click the "add to cart" button, NOT the "buy it now" button. Once all of your items are in your cart just pay for them from your cart and the combined shipping discount should be applied automatically. I offer a money back guarantee on every item I sell. If you are not 100% happy with your purchase just send me a message to let me know and I will buy back the item for your full purchase price. Hi there. I am selling this really amazing fossil horn coral specimen. I bought it at a gem show in Arizona and it was found in the Black Hills of Chester County, South Dakota. It is really amazing, and very detailed. It would be a great idea to have in a classroom for a teacher, or to have as a part of a gem and mineral and fossil collection. It was one of the nicest and most detailed ones that I have ever seen. I have never come across one that looked so complete and perfect. It's really interesting and I hope it finds a good home out there. RugosaFrom Wikipedia, the free encyclopediaFor the rose also sometimes just called "Rugosa", see Rosa rugosa.RugosaTemporal range: Ordovician–PermianPreЄЄOSDCPTJKPgNRugosaOrdovician.jpgSolitary rugose coral (Grewingkia canadensis) in three views; Ordovician, IndianaScientific classificationKingdom: AnimaliaPhylum: CnidariaClass: AnthozoaSubclass: HexacoralliaOrder: RugosaMilne Edwards & Haime, 1850[1]SubordersColumnariina†Cystiphyllina†Streptelasmatina† "Tetracorallia" from Ernst Haeckel's Kunstformen der Natur, 1904 Cross-section of Stereolasma rectum, a rugose coral from the Middle Devonian of Erie County, New YorkThe Rugosa, also called the Tetracorallia, are an extinct order of solitary and colonial corals that were abundant in Middle Ordovician to Late Permian seas.[2] Solitary rugosans (e.g., Caninia, Lophophyllidium, Neozaphrentis, Streptelasma) are often referred to as horn corals because of a unique horn-shaped chamber with a wrinkled, or rugose, wall. Some solitary rugosans reached nearly a meter in length. However, some species of rugose corals could form large colonies (e.g., Lithostrotion). When radiating septa were present, they were usually in multiples of four, hence Tetracoralla in contrast to modern Hexacoralla, colonial polyps generally with sixfold symmetry. Rugose corals have a skeleton made of calcite that is often fossilized. Like modern corals (Scleractinia), rugose corals were invariably benthic, living on the sea floor or in a reef-framework. Some symbiotic rugose corals were endobionts of Stromatoporoidea, especially in the Silurian period.[3][4] Although there is no direct proof, it is inferred that these Palaeozoic corals possessed stinging cells to capture prey. They also had tentacles to help them catch prey. Technically they were carnivores, but prey-size was so small they are often referred to as microcarnivores. Morphology[edit]Rugose corals always show tabulae, horizontal plates that divide the corallite skeleton. The corallites are usually large relative to different types of coral. Rugose corals will sometimes have dissepiments, which are curved plates connected to septa and tabulae. The symmetry can be distinguished by the orientation of septa in a transverse section of the coral. Rugose corals always display bilateral symmetry whereas tabulate and scleractinian corals show radial symmetry. Initially there are only 4 major septa; later minor septa are added in the 4 resulting spaces. The complex arrangement of septa is diagnostic of rugose corals. Rugose corals will also always have a columella, an axial rod which supports the septa running up the center of the corallite. It is present in rugose corals because they were mainly solitary and so required the extra support. Tabulate corals have no columella because they were always colonial and relied on the support of neighboring corallites.[5]

Price: 7.99 USD

Location: Tucson, Arizona

End Time: 2024-10-09T05:20:09.000Z

Shipping Cost: 5.95 USD