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This list of ammonites is a comprehensive listing of genera that are included in the subclass †Ammonoidea, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well as those that may be invalid or doubtful ( nomina dubia ), or were not formally published ( nomina nuda ), as well as junior ...
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. As the ammonites died, they sank to the bottom and were buried by layers of bentonitic mud that eventually became shale .
A primary difference between ammonites and nautiloids is the siphuncle of ammonites (excepting Clymeniina) runs along the ventral periphery of the septa and camerae (i.e., the inner surface of the outer axis of the shell), while the siphuncle of nautiloids runs more or less through the center of the septa and camerae.
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Triassic ammonites of North America (9 P) E. Early Triassic ammonites (9 P) L. Late Triassic ammonites (7 P) M. Middle Triassic ammonites (11 P) Pages in category ...
Pages in category "Late Cretaceous ammonites" The following 11 pages are in this category, out of 11 total. ... This page was last edited on 19 December 2022, at 13: ...
Nipponites is an extinct genus of heteromorph ammonites. The shells of Nipponites (primarily N. mirabilis) form "ox-bow" bends, resulting in some of the most bizarre shapes seen among ammonites. The ecology of Nipponites, as with many other nostoceratids, is subject to much speculation.
Maximites is a genus of Late Carboniferous ammonoids.Adult specimens were the smallest known ammonoids, only at about 1 cm (0.39 in) in diameter of shells. [1] Fossils are found in various Late Carboniferous marine strata in North America.