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.
These fossils are found as molds and casts with the cast filling the mold. It is important to realize that many fossil specimens represent more than one mode of preservation. For example, the cast in a Mazon Creek nodule also represents fossilization by authigenic mineralization, a type of replacement.