The crossword solution for the term FOSSIL SUFFIX is ITE. ITE is a suffix that is commonly used in geology to refer to a type of sedimentary rock or mineral that has been formed from the remains of an organism, such as a plant or animal. It is also used to refer to a fossilized form of an organism. Fossils are important to geologists because they provide evidence of past life on Earth and can be used to study the history of the planet.