How Do Index Fossils Help Relative Dating of Rock Layers? This Question Exploration helps Ss explain index fossils and relative dating using Steno’s law of superposition, the principle of original horizontality, and the principle of lateral continuity. Question Exploration Routine is an instructional methods that teachers can use to help a diverse student population understand a body of content information by carefully answering a critical question to arrive at a main idea answer. The Concept Co