Fossils are remnants or imprints of organisms that existed
in the pre-historic periods. Contrary to what is portrayed in popular media, fossils
are not limited to dinosaurs and their bones. In fact, the oldest fossils on record
are microfossils of bacteria that existed 3.5 BILLION years ago. This time span
falls within the Eoarchean era (the 4th era of the Archean eon) which
covers a time span stretching to 4 to 3.6 billion years ago.
Here is some more information on fossils and determining
their age:
https://brainly.ph/question/259350
