The most recent age in Earth’s 4.54 billion year history began 4,200 years ago and has officially been designated the Meghalayan Age, after the Indian state.

Earth’s recorded history is divided into eon, era, period, epoch and age, with the age being the smallest unit of geologic time.

Meghalaya is now part of geologic history thanks to a stalagmite found in the Mawmluh cave in the northeastern state.