Combine individual work with class group work. Ther are conjectures and tests in science, but no absolute proof. There is a best explanation of the time, but not an absolute explanation. Geology has a philosophical advantage, in that it utilizes chemistry, physics, biology, but not the other way around. The best part of teaching is learning something new.
Dinosaurs are a great intro to geology, science concepts and processes, and Earth science.
Still room for evidence and interpretation, the art of observation. The Mesozoic is more accessible than the Paleozoic - lots happeing of interest in the Cretaceous. Students at ease learn better. Course deals with skills needed beyond school. Students are often not motivated - must instill an attitude of the need to know.