Geologic Time is a crucial concept to understanding the history of the earth—including the evolution of life ... We will provide a list of web sites with relevant information. The geologic time scale ...

Stromatolites: You Can't Spell Mold Without Old One of the big problems with Kelvin's estimates for the age of the Earth was ...

Prehistoric time line, geologic time scale, photos, facts, maps, and more from National Geographic. Humans have walked the Earth for 190,000 years, a mere blip in Earth's 4.5-billion-year history.

"There's so much evidence now that the Earth's operating system is different ... "An epoch in the geologic time scale is defined by a clean planetary break in time. That means there's a before ...

I like to use a meter stick and be very intentional with my spacing to model time as a scale. I also avoid using ... preserved in the rock record of the Earth that is characteristic of a particular ...