Australian Opal Belemnite Fossil

The original aragonite internal shell dissolved and was replaced by opal in this belemnite fossil. It existed in the Cretaceous Period. Fossil was found in Coober Pedy, Australia. Specimen was on display at the Natural History Museum Vienna (Naturhistorisches Museum Wien) (August 2024).

Iridescent Placenticeras meeki Ammonite Fossils

Here are two pictures of a Placenticeras meeki (Böhm, 1898) ammonite fossils found in the Bearpaw Shale Formation of the Lethbridge District, Alberta, Canada. The fossil dates to the Cretaceous Period. Fossils were on display at the Natural History Museum Vienna (Naturhistorisches Museum Wien) on August 2024.

 

Conoclypus Sea Urchin Fossils

Here are two pictures of a Conoclypus (Agassiz, 1839) echinoderm fossil found in Bad Häring, Tyrol, Austria. The fossil dates to the Miocene Epoch, Oligocene Period. Fossils were on display at the Natural History Museum Vienna (Naturhistorisches Museum Wien) on August 2024.