Name: _____________________________ Directions: Use the picture and description to decide if each fossil is a mold fossil, cast fossil, trace fossil, or true form fossil. When this fish died, its body left an imprint in the mud. The body decomposed but the mold was filled with minerals which hardened into stone. This is a __________________ fossil. This footprint was left behind as a. Auto-graded practice and assessment of "Types of Fossils" for in-class and distance learning.