Search results
Results from the WOW.Com Content Network
Ammonites of prehistoric North America — a marine molluscs group of the prehistoric Cephalopods in North America. Subcategories This category has the following 5 subcategories, out of 5 total.
Ammonites were cephalopods, that thrived in tropical seas until becoming extinct along with the dinosaurs at the end of the Mesozoic era. The ammonites that form ammolite inhabited a prehistoric, inland subtropical sea that bordered the Rocky Mountains—this area is known today as the Cretaceous or Western Interior Seaway .
Ammonites in the permanent collection of The Children's Museum of Indianapolis. At least 57 species of ammonites, which were widespread and belonged to six superfamilies, were extant during the last 500,000 years of the Cretaceous, indicating that ammonites remained highly diverse until the very end of their existence.
Pages in category "Cretaceous ammonites of North America" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. A.
Although almost all evidence indicated that ammonites did not survive past the K–Pg boundary, there is some scattered evidence that some ammonites lived for a short period of time during the Paleocene epoch, although none survived the Danian (66-61 Ma); [1] they were likely extinct within 500,000 years of the K-Pg extinction event, which ...
The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina.They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and became one of the most distinctive components of Cretaceous marine faunas.
Oxynoticeras is an extinct genus of ammonite from the Early Jurassic [1] of Europe and North America. [2] This genus is characterized by its smooth shell, with almost invisible undulations on the flank, and a sharp keel. [3] Synonym Oxynotoceras was created by Buckman as misspelling. [4]
Pages in category "Late Cretaceous ammonites of North America" The following 28 pages are in this category, out of 28 total. This list may not reflect recent changes .