BACULITES (HETEROMORPH AMMONITE) - South Dakota, USA
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A classic heteromorph ammonite
70 million years old
Pierre Shale Formation.
A classic heteromorph ammonite
70 million years old
Pierre Shale Formation.
South Dakota, USA
Baculites is an extinct genus of ammonite that lived at the end of the Cretaceous period, just before ammonites (and dinosaurs) became extinct. It is known as a heteromorph ammonite which is a group of ammonites that did not have regularly coiled shells.
Baculites had a mostly straight shell and has been called 'walking stick rock'. Like normal ammonites its shell was divided into chambers and the divisions between the chambers can be seen as ornate suture lines when the shell is removed. When these creatures were alive South Dakota was an inland sea.
Baculites is an extinct genus of ammonite that lived at the end of the Cretaceous period, just before ammonites (and dinosaurs) became extinct. It is known as a heteromorph ammonite which is a group of ammonites that did not have regularly coiled shells.
Baculites had a mostly straight shell and has been called 'walking stick rock'. Like normal ammonites its shell was divided into chambers and the divisions between the chambers can be seen as ornate suture lines when the shell is removed. When these creatures were alive South Dakota was an inland sea.
This is a section of the body chamber with most of the shell intact. Some iridescence can be seen in the shell.
Click on a picture for a larger image
Size: approx 8.5 x 4 x 2 centimetres
Weight: 123 grams
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