How are eras and periods of the geologic time scale named? they are named for the places where geologists first described rocks or fossils from that time. their names are based on the names of scientists who discovered the rocks and fossils. they are named after plants and animals that lived during that time. their names are based on the number of centuries within that length of time.

Question: How are eras and periods of the geologic time scale named? they are named for the places where geologists first described rocks or fossils from that time. their names are based on the names of scientists who discovered the rocks and fossils. they are named after plants and animals that lived during that time. their names are based on the number of centuries within that length of time.

The geologic time scale is a system of chronological measurement that relates stratigraphy to time. It divides Earth's history into several units of time, called eras and periods. Eras and periods are named in different ways, depending on how geologists first recognized them. Some eras and periods are named for the locations where geologists first studied the rocks or fossils that belong to them. For example, the Cambrian Period is named after Cambria, the Latin name for Wales. Other eras and periods are named after the scientists who made important discoveries about the rocks or fossils. For example, the Ordovician Period is named after the Ordovices, a Celtic tribe that lived in Wales and was studied by Charles Lapworth. Some eras and periods are named after the characteristic life forms that existed during them. For example, the Jurassic Period is named after the Jura Mountains, where many dinosaur fossils were found. Some eras and periods are named after the numerical order of their occurrence. For example, the Triassic Period is named after the Latin word trias, meaning three, because it was the first of three periods in the Mesozoic Era.

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