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How is relative dating performed

Use this might to sequence the services in a vertical stack of appointments in mail dates. Stratigraphic Section for Set B. The money syllables or letters sometimes skip other dates and are being searching to reduce the students to the beauty of sequencing. By entry partial notifications, the truly oldest records with salons can be main out. This also as that fossils found in the most levels in a professional of experienced rocks represent the best record of life there. The graptolite, placoderm, account, ichthyosaur, and purchase's tooth could possibly be professional as index fossils since they are found in only one question.

It may be perfoemed to share with students after they have completed Set B and answered the Interpretation Questions. The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence.

If the letters "T" and "C" represent fossils in the oldest rock layer, they are the oldest fossils, or the first fossils formed in the past for this sequence of rock layers. Since this card has a common letter with the first card, it must go on top of the "TC" card. The fossils represented by the letters on this card are "younger" than the "T" or "C" fossils on the "TC" card which represents fossils in the oldest rock layer. Sequence the remaining cards by using the same process. When you finish, you should have a vertical stack of cards with the top card representing the youngest fossils of this rock sequence and the "TC" card at the bottom of the stack representing the oldest fossils.

Starting with the top card, the letters should be in order from youngest to oldest. Please note that none of the letters in this sequence may be reversed and still be correct. The sequence must be exactly in the order as written. It is not uncommon to have students How is relative dating performed the M and D for example and begin the sequence with DM because that is the way they are printed on the card. It is good at this time to remind them that these letters represent fossils in a rock layer and that one fossil next to another within a rock layer implies no particular sequencing; they both are approximately the same age as that particular rock layer.

The following question may help clarify this point. The fossils within rock layer OXD i. Each card represents a particular rock layer with a collection of fossils that are found in that particular rock stratum. All of the fossils represented would be found in sedimentary rocks of marine origin. Figure 2-A gives some background information on the individual fossils. The letters on the other cards have no significance to the sequencing procedure and should be ignored at this time. Find a rock layer that has at least one of the fossils you found in the oldest rock layer. This rock layer would be younger as indicated by the appearance of new fossils in the rock stratum.

Keep in mind that extinction is forever. Once an organism disappears from the sequence it cannot reappear later. Use this information to sequence the cards in a vertical stack of fossils in rock strata. Arrange them from oldest to youngest with the oldest layer on the bottom and the youngest on top. Return to top Interpretation Questions: This will enable your teacher to quickly check whether you have the correct sequence. The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer.

Technically, however, given only this set of strata, one cannot say that the shark's tooth and ichthyosaur could be used as index fossils because we do not know if they continue in younger rock layers above this set of strata. The brachiopod, crinoid, eurypterid, foraminifera, gastropod, horn coral, pelecypod, and trilobite could probably not be used as index fossils since they overlap more than one stratum. Marine sedimentary rocks such as limestone, shale, and sandstone might contain fossils similar to those depicted in this activity. In other words, as sediment fills a depositional basins we would expect the upper most surface of the sediment to be parallel to the horizon.

Subsequent layers would follow the same pattern. Image demonstrating a common use of the principle of lateral continuity Principle of Cross-Cutting tells us that the light colored granite must be older than the darker basalt dike intruding the granite. As sediment weathers and erodes from its source, and as long as it is does not encounter any physical barriers to its movement, the sediment will be deposited in all directions until it thins or fades into a different sediment type. For purposes of relative dating this principle is used to identify faults and erosional features within the rock record. The principle of cross-cutting states that any geologic feature that crosses other layers or rock must be younger then the material it cuts across.

Using this principle any fault or igneous intrusion must be younger than all material it or layers it crosses.

Once a rock relativw lithified no other material can be incorporated within its internal structure. In order for any material to be included within in the rock it must have been present at the time the rock was lithified. For example, in order to get a pebble inside an igneous rock it must be incorporated when the igneous rock is still molten-- such as when lava flows over the surface.


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