Welcome to the University of Maine School of Nursing! It is both an honor and a privilege to lead a School wholly committed to building a learning community of students and scholars where âeverybody knows your name.â Within the School of Nursing, you will find that that the gifts and talents of our faculty, staff, [â¦]
cast fossil (Noun). A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions; minerals gradually enter into the cavity, resulting in a cast, also called a mold fossil, which is in the general form of the original organism.
Fossils also form from molds and casts. If an organism completely dissolves in sedimentary rock, it can leave an impression of its exterior in the rock, called an external mold. If that mold gets filled with other minerals, it becomes a cast. An internal mold forms when sediments or minerals fill the internal cavity, such as a shell or skull, of an organism, and the remains dissolve. Organic remnants. In recent years, researchers have discovered that some fossils aren't just made of minerals.