Neogene Period, the name of the more recent of two periods (the other being the Paleogene Period) into which some geologists divide the Cenozoic Era. The Neogene began about 23,000,000 years ago and extends to the present. It includes the Miocene, Pliocene, and Pleistocene epochs. Most geologists today divide the Cenozoic Era into the Tertiary and Quaternary periods instead of the Neogene and Paleogene periods.
One grows from the ground and one from the ceiling, but sometime's it's hard to remember which is the stalactite and which is the stalagmite. How do they get there, anyway?
When it comes to fossils, specimens like Sue the Tyrannosaurus rex grab much of the attention. And while Sue is a staggering 67 million years old, she's a new kid on the block, compared to some of the oldest fossils ever found. What's older than Sue?