Dating of rocks fossils and geologic events laboratory 8
We read the information collectively, with particular emphasis on the definition of what constitutes an of the fossils contained in the lab, and the ones found in their Earth Science Reference Tables [ESRT]/Geologic History Timeline [ESRT] are examples of index fossils that meet these criteria.I then briefly explain the multi-part nature of the lab (note Procedure(s) A, B, and C below, which are done in order) and then have students transition quickly into their lab groups.Generally, I find that this doesn't take them too long, especially once they understand the concept of using the illustrated geologic evidence to date the index fossils.For example, once they note that the ammonite fossil, due to its presence in the Cretaceous period, is older than the Pecten index fossil, they can see that Layer C is actually the oldest layer, as the Ammonite fossil is at the of that layer, and superposition dictating the the subsequent layers underneath are older.
Procedure C is the final "mini-lab" in this lesson, and it is a complex amalgam of some challenging Regents-based, free response questions.
[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: Index Fossils & Correlation (Whole Lesson w/comments).
Additionally, if you would like all of the resources together in a PDF document, that can be accessed as a complete resource here: Index Fossils & Correlation (Whole Lesson)[PDF].
They can be challenging, but given what students were working with in the first two Procedures (A B), most groups shouldn't encounter too much trouble with this.
They'll have to utilize their Earth Science Reference Tables [ESRT]/Geologic History Timeline [ESRT] when working some of these out (as they feature index fossils found in the Geologic History Timeline pages of the ESRT.