99-Million-Year-Old Ammonite Found in Burmese Amber

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An international team of paleontologists has found a piece of amber containing the beautifully preserved ammonite, several marine and land organisms that lived 99 million years ago (Cretaceous period).

The 99-million-year-old piece of amber from northern Myanmar. Image credit: Nanjing Institute of Geology and Palaeontology.

Piece - Amber - Mine - Noije - Bum

The ammonite-bearing piece of amber was obtained from a mine located near Noije Bum Village, Tanaing Town, northern Myanmar. It is 33 mm long, 9.5 mm wide, and 29 mm high, and its mass is about 6 g.

The specimen was analyzed by Professor Bo Wang from the Nanjing Institute of Geology and Palaeontology and his colleagues from China, France, the United Kingdom and the United States.

Researchers - Tomography - Images - Ammonite - Sutures

The researchers used X-ray micro-computed tomography to obtain high-resolution 3D images of the ammonite, including its sutures, which are diagnostically important for ammonites.

They found that the ammonite belongs to Puzosia, an ammonite genus that first appeared in the Upper Albian age of the Cretaceous period (between 113 and 100 million years ago) and ranged through the Cenomanian age (between 100 and 94 million years ago).

Ammonite - Juvenile - Diameter - Mm - Shell

“The ammonite is a juvenile, has a maximum preserved diameter of 12 mm, and appears to retain the original aragonitic shell, on the basis of its appearance in reflected light,” they said.

“Its presence in the amber supports a late Albian-early Cenomanian age for the amber deposit. This discovery represents a rare example of dating using amber inclusions.”

Puzosia - Sp - Lateral

The ammonite Puzosia sp.: (A) lateral...
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