Fascinating Fossils A Unison Reading by Alfredo, Luis, Jesus, Gian, and Marcos

[The group stops at the end of the first paragraph] Alfredo: Everyone understand this paragraph? Jesus: Yes, you? Alfredo: The dinosaur dies and is in the rock. Then the people find the rock. Luis: Miss, he said it all! Jesus: The fossil people can know how the life changed. Luis: I understand that the dinosaurs died million years ago and we can find them all over the world. Jesus: The bones. Gian: The animals, plants die, the life on Earth changed through time. Alfredo: And at the museum we can see the fossils.

Relative Dating There are rules to relative dating. Here are the ones you need to know: Law of Original Horizontality Law of Superposition Law of Cross-cutting Relationship Law of Included Fragments Unconformities

Laws of Original Horizontality and Superposition Layers are deposited horizontally The oldest layer is on the bottom, the youngest layer is on the top

Law of Superposition: The Pizza Rule

Law of Superposition

Law of Cross-Cutting Relationships A fault or intrusion that goes through a rock layer is younger than that rock layer

Law of Cross-Cutting Relationships: The Twinkie Rule

Law of Cross-Cutting Relationships

Law of Included Fragments A rock layer with pieces of another rock layer inside it is younger than the pieces Pieces of a rock layer inside another rock layer are older than the rock layer they are inside

Law of Included Fragments: The Chocolate Chip Cookie Rule

Unconformities An unconformity can represent: lost time A tilting or folding event