👉 The term "ordovician" is a scientific term that refers to the Ordovician Period, which spanned from about 4.538 million years ago (about 201 million years ago) until about 4.269 million years ago (about 172 million years ago). This period of time is considered to be one of the most important in the history of Earth's geology, as it marked a significant shift from the Paleozoic Era
