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.

Smith’s map and ideas paved the way for a better understanding of geological time and laid the founding principles for geological surveys worldwide. His concept of using fossils to identify rocks is ...

Introduction to geology field methods including maps, cross sections, navigation ... and analysis of one-dimensional (e.g. time series) and two-dimensional datasets (i.e. spatial data). Techniques are ...

The larger, 6.8-magnitude quake happened at 11:49 a.m. Cuba time about 24 miles south of Bartolomé Masó, Cuba, data from the ...