Index fossil relative dating
" virtually all sedimentary systems have stratigraphic disorder at come scale is probably a common feature of the fossil record " Fossils out of Sequences Cutler Palaios June 1990 on The conclusion of some scientists is that the Law of Superposition just doesn't work Shindewolf Comments on Some Stratigraphic Terms American Journal of Science June 1957 " Historical geology relies chiefly on paleontology the study of fossil organisms. The Law of Superposition makes logical sense but in practice it is the nature of the fossils found in the sedimentary layers that determine the relative ages of the rocks.
The theory of descent with modification trumps the empirical evidence of superposition.
Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.
In this activity, students begin a sequencing activity with familiar items letters written on cards.
Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.
By matching partial sequences, the truly oldest layers with fossils can be worked out.
By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. Relative dating tells scientists if a rock layer is "older" or "younger" than another.
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Time factors of millions and billions of years is difficult even for adults to comprehend.