Carl Kerby on the fossil record and radiometric dating
Outline. • Conditions for fossilization. • Relative and absolute dating of fossils. • The story of life on Earth. • Missing links? NOTE: many slides in the four evolution lectures obtained from Web sources: Ken Miller. [“Hot Science, Cool Talks” at UT Austin],. Elizabeth Saunders, Carl Wozniak, Caltech Bio 1. relative ages of the samples. All you have to do is arrange the dates from oldest to youngest. Add these dates to your data table. Fossil Ages. The dates provided by the geology lab are as follows: mya, mya, mya, mya, mya,. mya, mya, mya, and mya. Dating the Fossil Record. 10 Jan Textbook Activity. Holt Life Science, pages – Objective: To understand the relative dating of fossils by sequencing a series of fossil samples from oldest to youngest. Students copied the table on page , then figured out the sequence of the 9 fossil samples (shown below left), according to the.
Teaching about Earth's history is a challenge for all teachers. Time factors of millions and billions of years is difficult even for adults to comprehend. However, "relative" dating or time can be an easy concept for students to learn. Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.
Sequencing the rock layers will show students how paleontologists use fossils to give relative dates to rock strata. Once students begin to grasp "relative" dating, they can extend their knowledge of geologic time by exploring radiometric dating and developing a timeline of Earth's history. These major concepts are part of the Denver Earth Science Project's "Paleontology and Dinosaurs" module written for students in grades The module is an integrated unit which addresses the following National Science Education Standards: Fossils indicate that many organisms that lived long ago are extinct.
The History of Life on Earth - Crash Course Ecology #1
Extinction of species is common; source of the species that have lived on the earth no longer exist. Fossils provide important evidence of how life and environmental conditions have changed. The complete "Paleontology and Dinosaurs" module takes approximately four weeks to teach. The "Who's On First? Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.
Find a read article layer that has at least one of the fossils you found in the oldest rock layer. By using this information from rock formations in various parts of the world and correlating the studies, scientists have been able to establish the geologic time scale. Fossil methods of dating fossil. 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. This will enable your teacher to quickly check whether you have the correct sequence.
Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers. Specific rock formations are indicative of a particular type of environment existing when the rock was being formed.
For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed.
Relative dating tells paleontologists which fossils are older than and 1. Most modern phyla of animals begin to appear in the fossil record during the The Science. Sequence the remaining cards by using the same process. The fossil record is a huge collection of fossils that document the history of life on Earth. When you complete this activity, you will be able to:
Return to top 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.
Locally, physical characteristics of rocks can be compared and correlated. On a larger scale, even between continents, fossil evidence can help in correlating rock layers. The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world.
This also means that fossils found in the lowest levels in a sequence of go here rocks represent the oldest record of life there. By matching partial sequences, the truly oldest layers with fossils can be worked out.
18: Lab: Dating the Fossil Record
By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. This is called relative dating.
Relative dating tells scientists if a rock layer is "older" or "younger" than another. 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.
Link reading earth history, these layers would be "read" from bottom to top or oldest to most recent.
If certain fossils are typically found only in a particular rock unit and are found in many places worldwide, they may be useful as index or guide fossils in determining the age of undated strata. By using this information from rock formations in various parts of the world and correlating the studies, scientists have been able to establish the geologic link scale.
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. Life Science Dating The Fossil Record Activity Answer Key you complete this activity, you will be able to: 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. Now, look for a card that has either a "T" or "C" written on it. 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. Return to top Procedure Set B: 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 go here 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. This will enable your teacher to quickly check whether you have the correct sequence. Three-lobed body; click, crawling, Life Science Dating The Fossil Record Activity Answer Key swimming forms; extinct NAME: Many were large a few rare species were 5 feet in length ; crawling and swimming forms; extinct NAME: Primitive form of chordate; floating form with branched stalks; extinct NAME: Jellyfish relative with stony Cnidaria calcareous exoskeleton found in reef environments; extinct NAME: Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies" NAME: Primitive armored fish; extinct NAME: Shelled, amoeba-like organism NAME: Snails and relatives; many living species NAME: Clams and oysters; many living species NAME: 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.
Explore this link for additional information on the topics covered in this lesson: Life Science Dating The Fossil Record Activity Answer Key most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.
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.
Three-lobed body; burrowing, crawling, and swimming forms; extinct. Many were large a few rare species were 5 feet in length ; crawling and swimming forms; extinct. Primitive form of chordate; floating form with branched stalks; extinct. Jellyfish relative with stony Cnidaria calcareous exoskeleton found in reef environments; extinct. Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies".
Dating the Fossil Record
Primitive armored fish; extinct. Snails and relatives; many living species. Clams and oysters; many living species. Squid-like animal with coiled, chambered shell; related to modern-day Nautilus.
Carnivore; air-breathing aquatic animal; extinct. Cartilage fish; many living species.