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Giant Ammonite Dactylioceras Fossil measures 29x20x4 inches. Giant Ammonite Dactylioceras Fossil is museum quality polyurethane cast. Made in USA. Colied Chamber shell Diameter 50cm or 19.5 inches. Our precise Ammonite can be used as a teaching tool, museum Ammonite exhibit, home decor Ammonite decoration, or office decor Ammonite decoration.
Giant Ammonite Dactylioceras are generally small, averaging 2.6 inches in diameter. They have a strong, ribbed shell. The ribs are slightly inclined forward, running over the outer edge, and either simple or forking at outer end.
Though they eventually died out 180 million years ago, their style of ribbing was copied by numerous subsequent ammonite genera until the whole group became extinct 66 million years ago with the dinosaurs.
Giant Ammonite Dactylioceras has been collected from almost every continent, and was one of the most successful ammonite lineages ever. They are abundant throughout Europe, with exceptionally fine specimens found in England and Germany.
Like many other ammonites, the genus Dactylioceras is extremely important in biostratigraphy, being a key index fossil for identifying their region of the Jurassic.
Dactylioceras commune has shells reaching a diameter of 9–11 centimetres (3.5–4.3 in). Usually the average diameter reach about 24.1 millimetres (0.95 in), while the average width is 8.20 millimetres (0.323 in).
In these small but strong shells ribs run straight or are slightly convex across the venter. These ribs are quite coarse on the outer whorls and finer on the inner whorls. The whorl section is as round as a circle.
Fossils of Giant Ammonite Dactylioceras have been found in Lower Jurassic, Toarcian age of Canada, France, Italy, Russia, Serbia and Montenegro, United Kingdom and United States.
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|Dimensions||29 × 20 × 4 in|
|Giant Ammonite Dactylioceras Facts:||