The black "marble" tombstone is made of limestone that likely came from Belgium. International Journal of Historical Archaeology A mysterious black tombstone that marked the final resting place of a ...

Like most people, you have very likely heard the word limestone. We use the word frequently in Windows Through Time. But do you really know what a limestone is? If you saw one, could you identify it?

The 150-million-year-old Solnhofen Limestone in southern Germany contains prehistoric lagoon deposits known for yielding wonderfully preserved fossils, including those of pterosaurs: flying reptiles ...

v. 1. Productus limestone fossils. (text and atlas of plates) 1879-87.--v. 2. Fossils from the Ceratite formation. pt. 1. 1895.--v. 4. pt. 1-2, Geological results ...

For millions of years, the land we now call the United States has been home to towering prehistoric beasts, strange sea creatures, and lush ancient forests that no longer exist. Evidence of this ...

In the aftermath of the giant asteroid that crashed into the Yucatan Peninsula about 66 million years ago, approximately 75% ...