When geologists make field observations, they typically focus on the rock before them and its color, density, mineral makeup, fossil content, and other features. But they often would be well-served by looking at the strata’s context as well.

by Frank Sherwin, D.Sc. (Hon), & Brian Thomas, PhD. *

When biologists found hybrid sharks in Australian waters, lead researcher Jess Morgan told Discovery News, “This is evolution in action.”¹