Fossils can form in several ways.

Slides:



Advertisements
Similar presentations
Fossils can form in several ways.
Advertisements

Evidence for Evolution
Fossils and Geologic Time
Evidence for evolution in Darwin’s time came from several sources.
Ch 12: The History of Life.
Only a tiny percentage of living things became fossils.
Bellringer 11/21/13 What is a fossil?.
Evolution of Populations
12.2 Fossils: Evidence of Past Life
Evolution of Populations
Chapter 11 Fossils Fossil: evidence such as the remains, imprints, or traces of once living organisms preserved in rocks Many times dead.
Fossils & History of Life Chapter 12 Biology. Science 101 United streaming—fossils 59sec clip.
12.1 The Fossil Record KEY CONCEPT Specific environmental conditions are necessary in order for fossils to form.
 The Fossil Record – made up of all the fossils ever discovered on Earth  provides evidence that species have changed over time  Fossil – the remains.
Fossils & History of Life Chapter 12 Biology. KEY CONCEPT Specific environmental conditions are necessary in order for fossils to form.
FOSSILS & EVOLUTIONARY RATE Dr. Jagdish kaur P. G. G. C
LE1 – 06 – Life in Geological Time
-Evidence of past life forms
Fossils can form in several ways.
History of Life Section 14.1.
Chapter 6.3 Absolute Dating
Evidence of Change Chapter 10.
The fossil Record.
Specific conditions are needed for fossilization.
FOSSILS Essential Questions: What are fossils and how are they formed?
What are Fossils? Fossils are the evidence or remains of once-living plants or animals Fossils provide evidence of past existence of a wide variety of.
Ch6 Sec3 The Fossil Record.
Evidence for evolution in Darwin’s time came from several sources.
Geologic Time Scale, Fossils, and Dating
Introduction… no notes from this slide…
The Fossil Record Sect. 6.2 and 6.3.
Copyright Pearson Prentice Hall
Evidence for evolution
Evidence for Evolution
KEY CONCEPT Specific environmental conditions are necessary in order for fossils to form. Tollund man 2200 yrs. Ago Found in a peat bog in Denmark.
Fossils can form in several ways.
Dinosaur Fossil Phenomenon
14.1 Section Objectives – page 369
How do we know that the earth is 4.6 billion years old?
AGENDA Reading Preview 12.1 Fill-in Notes 12.1 Power notes
Fossils & Fossil Dating
What are some things we can learn about fossils?
Fossil Evidence of Evolution
Absolute Dating.
Ch. 6 Vocabulary.
64R: Ch 12 The History of Life 12.1 The Fossil Record
Earth Through Time Clues to Earth’s Past.
Fossils can form in several ways.
Species Fossil Adaptation Evolution Scientific Theory
Fossils can form in several ways.
Dating & Fossils Pp and
Fossils can form in several ways.
Fossils & History of Life
Fossils can form in several ways.
Fossils can form in several ways.
The Fossil Record Evidence of Change.
Absolute Dating.
Fossils can form in several ways.
Geologic Time Earth Science Ch.12.
Fossils can form in several ways.
Fossils can form in several ways.
Fossils can form in several ways.
Evidence for Evolution
Fossils can form in several ways.
Fossils can form in several ways.
Relative and Absolute Dating
Fossils can form in several ways.
Fossils can form in several ways.
Evidence for Evolution
Presentation transcript:

KEY CONCEPT Specific environmental conditions are necessary in order for fossils to form.

Fossils can form in several ways. 1. Permineralization occurs when minerals carried by water are deposited around a hard structure.

2. A natural cast forms when flowing water removes all of the original tissue, leaving an impression.

3. Trace fossils record the activity of an organism.

4. Amber-preserved fossils are organisms that become trapped in tree resin that hardens after the tree is buried.

5. Preserved remains form when an entire organism becomes encased in material such as ice.

Specific conditions are needed for fossilization. Only a tiny percentage of living things became fossils. Permineralization, part 1 (upper left): The process of permineralization requires rapid burial in an area with water and continuous sedimentation. Permineralization, part 2 (upper right): The process of permineralization requires rapid burial in an area with water and continuous sedimentation.

Permineralization, part 3: The process of permineralization requires rapid burial in an area with water and continuous sedimentation. INFER: What conditions could occur that would prevent an organism from being preserved through permineralization? SUMMARIZE: Why are so few complete fossils discovered?

Radiometric dating provides an accurate way to estimate the age of fossils. Relative dating estimates the time during which an organism lived. It compares the placement of fossils in layers of rock. Scientists infer the order in which species existed. This method does not provide the actual age of fossils.

Radiometric dating uses decay of unstable isotopes to estimate a fossil’s actual, or absolute age.. All atoms of a given element have the same number of protons. Isotopes are named for the total number of protons and neutrons in their nuclei. neutrons protrons

Radiometric dating uses decay of unstable isotopes. Isotopes are atoms of an element that differ in their number of neutrons. A half-life is the amount of time it takes for half of the isotope to decay.

Scientist measuring radioactive decay from a sample of bone.