編號 84073561

已出售
菊石亞綱 - 動物化石 - Dactylioceras  (沒有保留價)
最終出價
€ 30
一週前

菊石亞綱 - 動物化石 - Dactylioceras (沒有保留價)

Lower Jurassic Period- C. 200-174 Million Years Ago Order to which the fossil belongs: Ammonitida Name of which the family belongs: Dactylioceratidae Informal name of the fossil: Ammonite The shell form is evolute with many whorls visible as well as a wide and shallow umbilicus. This Dactylioceras has fine branching ribs which are closely spaced and pass over a rounded venter. They are generally small, averaging 7cm in diameter and were thought to be a slow swimmer. Ammonites are a form of ammonoid which are distinguished by their complex suture lines. They evolved very rapidly to produce numerous species and genera, but it was during the Late Cretaceous period that the ammonites and other marine groups, like belemnites, and terrestrial groups, like dinosaurs became extinct. The name ammonite, was inspired by the spiral shape of their fossilized shells, resembling tightly coiled rams’ horns. Many ammonoids probably lived in the open water rather than at the sea bottom, this is due to the fact that their fossils are often found in rocks that were laid down under conditions where no bottom-dwelling life is found. They are typically evolute with the inner whorls exposed, but some are commonly stout and more involute and strongly ribbed with pronounced tubercles. A nice example with good definition and cut base for display. Ammonite: 45mm x 45mm diam Nodule: H: 102mm x W: 65mm approx

編號 84073561

已出售
菊石亞綱 - 動物化石 - Dactylioceras  (沒有保留價)

菊石亞綱 - 動物化石 - Dactylioceras (沒有保留價)

Lower Jurassic Period- C. 200-174 Million Years Ago

Order to which the fossil belongs: Ammonitida
Name of which the family belongs: Dactylioceratidae
Informal name of the fossil: Ammonite


The shell form is evolute with many whorls visible as well as a wide and shallow umbilicus. This Dactylioceras has fine branching ribs which are closely spaced and pass over a rounded venter. They are generally small, averaging 7cm in diameter and were thought to be a slow swimmer.

Ammonites are a form of ammonoid which are distinguished by their complex suture lines. They evolved very rapidly to produce numerous species and genera, but it was during the Late Cretaceous period that the ammonites and other marine groups, like belemnites, and terrestrial groups, like dinosaurs became extinct.

The name ammonite, was inspired by the spiral shape of their fossilized shells, resembling tightly coiled rams’ horns. Many ammonoids probably lived in the open water rather than at the sea bottom, this is due to the fact that their fossils are often found in rocks that were laid down under conditions where no bottom-dwelling life is found. They are typically evolute with the inner whorls exposed, but some are commonly stout and more involute and strongly ribbed with pronounced tubercles.

A nice example with good definition and cut base for display.

Ammonite: 45mm x 45mm diam
Nodule: H: 102mm x W: 65mm approx

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