1 / 9

fossiliferous Fossils and geochronological Geologic Time Scale

fossiliferous Fossils and geochronological Geologic Time Scale. By Erica Shenoi Mrs. Bratcher Science- B Block 14 December 2011. What Are fossils???. Fossils are remains of past animals, humans, plants, and other historical life, that can be found impressed into rocks .

xandy
Download Presentation

fossiliferous Fossils and geochronological Geologic Time Scale

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. fossiliferous Fossils and geochronological Geologic Time Scale By Erica Shenoi Mrs. Bratcher Science- B Block 14 December 2011

  2. What Are fossils??? Fossils are remains of past animals, humans, plants, and other historical life, that can be found impressed into rocks.

  3. Petrified fossils When a fossil organism is subjected to mineral replacement, it is called a petrified fossil. A petrified fossil can be a rock that contains crystals or gems inside of them, like the one on the bottom left. They are formed when a mineral slowly takes the place of original, once-living material.

  4. Cast Fossils A cast fossil forms when a mold fossil is filled with some form of mineral. It is a form of fossil, formed when an animal, plant, or other organism dies, its flesh decays and bones fade due to chemical reactions. Minerals gradually enter into the cavity, resulting in a cast, also called a mold fossil, which is in the general form of the original organism.

  5. Trace Fossils Trace fossils give us proof of animal life from the past. Trace fossils include things like foot prints, burrows, and other organisms. Trace fossils are formed in place and can therefore tell us about the ancient environment in which the animal lived.

  6. What do fossils show??? Fossils show remains of past organisms such as plants, animals, insects, etc.

  7. What causes rock layers to change??? • Huge water erosions • Natural disasters • Meteors • Dynamite • Human-made objects

  8. Geologic Time Scale • provides a system of chronologic measurement relating stratigraphy to time • used by geologists, paleontologists and other earth scientists to describe the timing and relationships between events that have occurred during the history of the Earth

  9. Works Cited Earth Science. 2011. Wiki Spaces. Web. 14 December 2011 <http://discoversciencefun.wikispaces.com> Fossil. 2011. Wikipedia. Web. 14 December 2011 <http://en.wikipedia.org> Geologic Time Scale. 2011. Wikipedia. Web. 15 December 2011 <http://en.wikipedia.org> Mold Fossils. N.d. Boscobel. Web, 15 December 2011 <http://www.boscobel.k12.wi.us> What is a Cast Fossil? N.d. Answers. Web. 14 December 2011 <http://wiki.answers.com>

More Related