Places such as Purgatory Chasm and Millstone Hill, in Worcester's Green Hill Park, bear witness to the work of the glaciers.

A new study of ancient fossil trails pushes the origins of complex life deeper into Earth’s history, before the Cambrian Period began.

The St. Francois Mountains in Missouri are an ancient mountain range that has existed since the Precambrian period, which makes it one of North America's oldest igneous rock formations. Rising over ...

The Property is underlain by rocks from the Grenville Province of the Precambrian Canadian Shield. The Grenville was formed under conditions that were very favorable for the development of ...