â¢ SULTAN (noun). The noun SULTAN has 1 sense: 1. the ruler of a Muslim country (especially of the former Ottoman Empire). Familiarity information: SULTAN used as a noun is very rare. SULTAN (noun). The noun SULTAN has 1 sense: 1. the ruler of a Muslim country (especially of the former Ottoman Empire). Familiarity information: SULTAN used as a noun is very rare.
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.
What is a fossil? A mold fossil is the space in a rock that has the actual shape of the remains of a living thing. The left ammonite is the mold and the right half of the ammonite is the cast fossil. Dinosaur footprints can also be classified as mold fossils.hat is a fossil? A mold fossil is the space in a rock that has the actual shape of the remains of a living thing. The left ammonite is the mold and the right half of the ammonite is the cast fossil. Dinosaur footprints can also be classified as mold fossils.