Find a degree that fits your goals. This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional eventsand notable biological events appearance, relative abundance, or extinction of certain life forms. November 11th was a typo! You will also be able to: In reading earth history, these layers would be "read" from bottom to top or oldest to most recent.
Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies" NAME:
This would also mean that fossils found in the deepest layer of rocks in an area would represent the oldest forms of life in that particular rock formation. Earn certificates of completion. The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages. Relative dating tells scientists if a rock layer is "older" or "younger" than another. Time factors of millions and billions of years is difficult even for adults to comprehend. 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. The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place.