what event marks the beginning of the paleozoic era
Online exhibits: Geologic time scale. The Paleozoic Era. The Paleozoic is bracketed by two of the most important events in the history of animal life. At its beginning, multicelled animals underwent a dramatic explosion in diversity, and almost all living animal phyla appeared within a few millions of years.nline exhibits: Geologic time scale. The Paleozoic Era. The Paleozoic is bracketed by two of the most important events in the history of animal life. At its beginning, multicelled animals underwent a dramatic explosion in diversity, and almost all living animal phyla appeared within a few millions of years.