NAME:______________________________________  DATE:____________________

 

Web Geologic Time Machine

 

Go to the URL: http://www.ucmp.berkeley.edu/help/timeform.html

 

Answer the following questions:

  1. What is the time frame of the Precambrian Time?

 

 

  1. How old is the Earth in millions of years? How old is the Earth in billions of years?

 

 

 

  1. Click the Archean button on the chart. What was the atmosphere like during the Archean time?

 

 

 

  1. How old are our oldest fossils?

 

 

  1. What are stromatolites?

 

 

  1. Click on Proterozoic. The Precambrian Era takes up what fraction of the history of the Earth?

 

 

  1. List the six major events that took place during the Precambrian Era.

 

 

 

  1. When did the first eukaryotes appear?

 

 

  1. What event allowed for the explosion of eukaryotes?

 

 

  1. Click on the back arrow. What is the time frame of the Paleozoic Era?

 

 

  1. Click on the Paleozoic Era. What major event happened at the beginning of the Paleozoic Era?

 

 

  1. What major event happened at the end of the Paleozoic Era?

 

 

  1. The Paleozoic Era was bracketed by what two global super-continents?

 

 

  1. Click on the back arrow. List the six periods of the Paleozoic Era.

 

 

  1. Click on Cambrian. What is the “Cambrian Explosion”?

 

 

  1. Click on the back arrow and then on Ordovician. What are the three most common marine invertebrates found during the Ordovician Period?

 

 

  1. Click on the back arrow and then on Devonian. What types of plants evolved during the Devonian Period?

 

 

  1. What two major groups of land animals appeared during the Devonian Period?

 

 

  1. List three of the many different organisms that lived in the oceans during the Devonian Period.

 

 

  1. Click on the back arrow and then on Carboniferous. Why is this period called the Carboniferous Period?

 

 

  1. What is one of the greatest evolutionary innovations of the Carboniferous Period?

 

 

  1. Click on the back arrow and then on Permian. Which type of organisms mainly became extinct at the end of the Permian Period (also the Paleozoic Era)?

 

 

  1. What is a gymnosperm?

 

 

  1. What is Pangea?

 

 

  1. Click on the back arrow. What is the time frame of the Mesozoic Era?

 

 

  1. List the three periods of the Mesozoic Era.

 

 

  1. Click on Jurassic. What type of animal what very common during the Jurassic Period?

 

 

  1. List five types of dinosaurs found during the Jurassic Period.

 

 

  1. How big were the mammals that appeared during the Jurassic Period?

 

 

  1. Click on the back arrow TWICE. What is the time frame of the Cenozoic Era?

 

 

  1. Click on Cenozoic. The Cenozoic Era is sometimes called the “Age of the Mammals”. Why is this misleading?

 

 

  1. What are the three major periods of the Cenozoic Era?

 

 

  1. Click on the Pleistocene. What animal was one of the largest on land during the Pleistocene Epoch?

 

 

  1. What major geological event took place during the Pleistocene Epoch?

 

 

  1. What are the Homo sapiens?

 

 

  1. Where were Homo sapiens found during the Pleisocene Epoch?