How do Fossils Form?

Fossils are essentially ghosts of the Earth's past preserved in rocks. They teach us about what life used to be like thousands, even millions, of years ago! But how were these forms created? There are many types of fossils and they can all be made in different ways. It might be more complicated than you think!

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[nealdo]

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.

[thomasfarley]

Excellent! Posted the link to my rockhounding site. Thanks to one and all.

[GameOverYg]

sources? I'm not questioning fossils, I just want to see the research!

[Depressed_Dinosaur]

Great video - but PLEASE lose the background "music."