The first true vertebrates evolved about this time. The first vertebrates (our ancestors) evolved during the Ordovician period. This time period is also known as the […]
A seismometer and seismograph are somewhat synonymous in they are both instruments for the recording of movements of the earth associated with earthquakes or other seismic […]
Index are fossils of common and widely distributed species that can be used to date unknown fossils. Index fossils are very useful in paleontology. These fossils […]