(2) There's mostly left-handed amino acids (not yet decayed to a 50/50 right-to-left ratio) in chert and dinosaur eggshells.
(3) There's flexible and even transparent blood vessels, cells, and even and hadrosaur DNA (with a half-life of ~521 years) in dinosaur soft tissue fossils.
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There are two main methods determining a fossils age, relative dating and absolute dating.
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.
Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.
Some critics, particularly religious fundamentalists, argue that neither fossils nor dating can be trusted, and that their interpretations are better.
Sometimes we can find fossils of seashells or footprints in small rocks, while at other times, entire skeletons are found in the walls of cliffs or caves.