Relitive dating

The resulting sequence from the bottom-most sediments would be oldest-to- young-to- older.

[Note: For embedded comments, checks for understanding (CFUs), and key additional information on transitions and key parts of the lesson not necessarily included in the below narrative, please go to the comments in the following document: Dating & Rock Layering (Whole Lesson w/comments).

Some types of relative dating techniques include climate chronology, dendrochronology, ice core sampling, stratigraphy, and seriation.

Seriation uses the assumption that once a tool was developed, its use would become more widespread.

For example, the presence of recycled bricks at an archaeological site indicates the...

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Finally, students may need their Earth Science Reference Tables [ESRT] for parts of the lesson (a document used widely in the New York State Earth Science Regents course) as well.] This is the first, and one of the most important, lessons in the new unit.

Sediments are usually laid down in horizontal beds.

Any observable tilting or swirling is due to disruption of the process. Material that intrudes or cuts into a horizontal bed is assumed to be younger than the material that is disrupted.

Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.

Ice core sampling normally uses the assumption that the ring bands observed represents years.