How Are Index Fossils Used To Determine The Age Of Fossils And process of using index fossils is describes by the late creationist author and ph. a scenario does not answer all of the questions or solve all of the problems that radiometric dating poses for those who believe the genesis account of creation and the flood. once our geologist had the “index fossil” that was found approximately in the same layer as the newly discovered fossil, he would then see where in the geologic column it came from and presto, he now had a date for his newly discovered fossil. resource for procedure b is ostensibly much more simplistic, although it has the inclusion of index fossils in the correlating rock layers (b, c, and d). say that the shark's tooth and ichthyosaur could be used as index fossils because we do.) carefully examine the second set of cards which have sketches of fossils. this rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock. the age of the carbon in the rock is different from that of the carbon in the air and makes carbon dating data for those organisms inaccurate under the assumptions normally used for carbon dating.
Eighth grade Lesson Index Fossils & Correlation Lab partial sequences, the truly oldest layers with fossils can be worked out. for example, if they believed it would take 200 million years for an ammonite (somehow) to turn gradually into say a dog, then all rocks containing fossil ammonites (the “index fossil”) would be given an “age” 200 million years older than rocks containing fossils of dogs:“… the geological column and approximate ages of all the fossil-bearing strata were all worked out long before anyone ever heard or thought about radioactive dating … there are so many sources of possible error or misinterpretation in radiometric dating that most such dates are discarded and never used at all, notably whenever they disagree with the previously agreed-on [index fossil] dates. the youngest fossils of this rock sequence and the "tc" card at the bottom of the. cards in set b represent rock layers containing various fossils. this technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils (like those of the dinosaurs alleged to be millions of years old). the short half-life of carbon-14 means it cannot be used to date fossils that are allegedly extremely old, e. if certain fossils are typically found only in a particular rock unit and are found in many places worldwide, they may be useful as index or guide fossils in determining the age of undated strata.. it is good at this time to remind them that these letters represent fossils in a rock layer.