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They are often called ammonites, which is most frequently used for members of the order Ammonitida, the only remaining group of ammonoids from the Jurassic up until their extinction. [2] Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often ...
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 ...
Hoplites is a genus of ammonite that lived from the Early Albian to the beginning of the Middle Albian. [2] Its fossils have been found in Europe, Transcaspia and Mexico.Shell has compressed, rectangular till depressed and trapezoidal whorl section.
An iridescent ammonite from Madagascar Map of North America highlighting the shallow inland sea present during the mid-Cretaceous period. Ammolite comes from the fossil shells of the Upper Cretaceous disk-shaped ammonites Placenticeras meeki and Placenticeras intercalare, and (to a lesser degree) the cylindrical baculite, Baculites compressus.
A fossil of Hoploscaphites, an ammonite believed to have survived the K-Pg extinction event well into the Paleocene. The term Paleocene ammonites describes families or genera of Ammonoidea that may have survived the Cretaceous–Paleogene extinction event, which occurred 66.043 million years ago.
Of the few genera of ammonites which are thought to have survived the K-Pg extinction event into the Danian period (65-61 Myr) of the Paleogene, Hoploscaphites is the most widely and reliably recorded, with finds in Denmark, the Netherlands and the United States, and a possible record in Turkmenistan.
Dactylioceras was a widespread genus of ammonites from the Lower Jurassic period, [1] approximately 180 million years ago . [2] and Like many other ammonites, the genus Dactylioceras is extremely important in biostratigraphy, being a key index fossil for identifying their region of the Jurassic. It had a nearly cosmopolitan distribution during ...
Douvilleiceras is a genus of ammonites from the Middle to Late Cretaceous. ... D. inaequinodum fossils have been found in Albian strata of France. [2] [3] Gallery