Origin :Fox Hills Formation-South Dakota, USA
とても希少なこのアンモナイトはUSAサウスダコタ州より産出されました。種類はスフェノディスカス、アンモナイト、アンモライト化しており、美しいレッド発色とともに、パープル・ブルーカラーもみえます。また更に ホプロスカフィテスが一緒に母岩に入っている とてもレアなディスプレイピースです。
Sphenodiscus is an extinct genus of acanthoceratacean ammonite. The genus has been found from many continents and is thought to have had a large global distribution during the Maastrichtian stage of the Late Cretaceous. It was one of the last ammonoids to have evolved before the entire subclass became extinct at the end of the period during the Cretaceous–Paleogene extinction event.
This is a large, Sphenodiscus splendens ammonite from the Fox Hills Formation that has a brilliant red iridescent shell. This beautiful iredescent shell is basically the same as the Ammolite (name trademarked) from Alberta.certain species at different stages of ontogenic development may possess many small tubercles along their surfaces. Sphenodiscus had a complex suture pattern with many small branching lobes and saddles.
An extremely rare ammonite from the Fox hills formation in South Dakota. Ammonite and many other small fossils and impressions,clams, ammonites.
During the Upper Cretaceous, a huge shallow inland sea stretched from what currently is the Gulf of Mexico northward and through Canada. Ammonites including members of Ammonita Superfamily Scaphitaceae (the scaphites) were ubuiquitous. The Fox Hills Formation, which spans from Alberta down into Colorado, was formed when the Western Interior Seaway retreated in the late Cretacous. It contains a diverse biota, including Tyrannosauroid dinosaurs like T-Rex and marine mosasaurs.
Fox Hill scaphites typically exhibit red and/or green hues, and browns, a mixture of red and green. Others are whitish, a nearly uniform mixture of the color spectrum.
The primary diagnostic feature of scaphites is somewhat J-shaped, bauplan, one that is less tightly coiled than most ammonites. They are grouped among the heteromorph ammonites comprising suborder Ancyloceratina, because of these irregularly-coiled shells. The scaphites of Fox Hills Formation are normally found in concretions, like fossils of Mazon Creek, some very large, that weather out from stream beds and hillsides. And like Mazon Creek, exquisite preservation is often found. Some of the different scaphite species exhibit shell ornamentation, including tubercles, sutures, keels, and ribs.
YouTube Video https://www.youtube.com/watch?v=LVptoqcP2UU Bearpow Formation Alberta, Canada 100% Natural Earthy Colors With A Great Iridescence’ Placenticeras Intercalare Fossil . This intercalare fossil is an excellent display specimen. It’s not compressed...
Ammonite Fossil - Placenticeras Meeki This gem grade ammonite fossil has flashy blue, green, yellow and reds. The gem has a chromatic color shift from red to green and...
Sold Out $ 485.00
Ammonite Fossil - Placenticeras Meeki 263x215x33mm 2060g Geologic Time - Cretaceous Period - Approximately 71 millions years ago Origin ： Bearpaw Formation, Southern Alberta, Canada ...