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After teaching for four years in the Department of Geology at the University of South Florida, Allmon became the Director of the Paleontological Research Institution.His research specialties include the systematics of Cenozoic gastropods and the interaction between ecology and macroevolution, particularly speciation and biodiversity.Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.

The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium.In 1990, Karen received honorable mention for Colorado Teacher of the Year.Karen's first book, Primary Dinosaur Investigations, was co-authored with Craig A. Marsha Barber has 20 years of classroom teaching experience in grades 7-12 with a wide variety of science activities, curriculum projects, and awards to her credit.