Great presentation, well put together. I would not change a thing but you might have added the duplication (preserved impression) form that is the most common locally and the most confusing for some people, an internal mold. Also known as "steinkerns" many people want to call them internal casts because they are usually convex and most molds are concave and you see it wrong in many videos made by amateurs. Ammonites that expose their sutures are always internal molds. The four possible duplication forms are internal and external, molds and casts. You could make a whole video on just trace fossils so I can see why you limited that discussion. The ones I know of are tracks, tail dragging marks, claw marks, swimming traces, infilled burrows, coprolites, feeding traces, urolites, regurgitites, body rests, gastroliths, bite marks, termite mounds and bio-accretionary structures like stromatolites. Some even include banded iron formations which show periods of presence or absence of microbes.
