What era is known as the age of invertebrate?

The era known as the "Age of Invertebrates" primarily refers to the Paleozoic Era, particularly the Cambrian and Ordovician periods, when invertebrate life forms flourished and diversified dramatically. During this time, organisms such as trilobites, brachiopods, and mollusks became prominent in marine ecosystems. This period set the foundation for the evolution of more complex life forms, including vertebrates, which began to appear later in the Paleozoic. The dominance of invertebrates continued well into the subsequent periods of the Paleozoic.