Prehistoric Life Terminology

adjective preserved in the form of a fossil; antiquated or rigid in manner

• The fossilized remains of ancient sea creatures can be found in the museum.
• I heard they found some fossilized bones while digging in the backyard.
• Check out this cool fossilized shell I found at the beach!
• Her beliefs were fossilized and resistant to change.

noun a genus of trilobites that existed in the Ordovician period

• The acidaspis is an extinct genus of trilobite that lived during the Ordovician period.
• I just learned about this cool trilobite called acidaspis from the Ordovician period.
• Check out this funky acidaspis trilobite from way back in the day!
• The acidaspis trilobite reminds me of a resilient survivor from ancient times.

noun a taxonomic family of extinct ammonites

• The Acroceratidae family is a group of extinct ammonoids that lived during the Devonian period.
• I read an interesting article about the Acroceratidae and their unique shell structures.
• Those Acroceratidae fossils are really cool to look at!
• The Acroceratidae family tree branches out into many different species.