Commitment Bonus â This has to do with the total amount of classes taught in the month long pay period. If you teach less than 30 classes a month there is no bonus. If you teach 30-45 classes in a pay period, you receive a $.50 per class bonus.
There are four primary types of fossils: mold fossils, cast fossils, trace fossils and true form fossils. Cast fossils are formed when the imprints created by fossils, called mold fossils, are filled in by minerals over time. Definition of Cast Fossils. A cast fossil is a type of fossil indicator.
A fossil skeleton is not hard to understand, it is mineralized bone. Impressions are similar to pressing a leaf in a book to dry and preserve it. A cast is a little different. A cast is defined as: The secondary rock or mineral that fills a natural mold, producing a replica of a fossil. (emphasis added) Bates, R. L., Jackson, J. A., editors, (prepared by the American Geological Institute), 1976, Dictionary of Geological Terms, third edition; Anchor Books (Doubleday).