|
| You might also like: | Sharks - Table of Contents | Shark Extremes | WHALE SHARK - Zoom Sharks | BASKING SHARK - Zoom Sharks | Shark Book (Cover) | Today's featured page: Temperature and Thermometers |
 Table of Contents |
Enchanted Learning All About Sharks! |
 Geologic Time Chart |
| Introduction to Sharks | Introduction to Rays | Anatomy | Shark and Ray Species | Extreme Sharks | Extinct Sharks | Classification | Shark Glossary | Shark Index | Printables, Worksheets, and Activities |
|
ALL ABOUT SHARKS! | |
| What is a Shark? | Shark Information Sheets | Shark Printouts to Color | Evolution of Sharks | Extreme Sharks |
Sharks have existed for over 350 million years. They evolved over 100 million years before the dinosaurs did. This was long before people evolved. Most fossil evidence of early sharks is from fossilized teeth and a few skin impressions. Cladodonts, primitive sharks, had double-pointed teeth, were up to 6 feet (2 m) long, ate fish and crustaceans, and lived about 360 million years ago (mya).
The earliest-known primtitive shark remains are fossil "scales" that date from about 420 million years ago, during the early Silurian. The earliest shark genera are Mongolepis, Polymerolepis, and Palaeospondylus.
Other early sharks included Orthacanthus, Hybodus and Megalodon. Modern forms of sharks evolved during the Jurassic period, about 150 mya; this was the time of the giant dinosaurs like Brachiosaurus.
|
Zoom Sharks ALL ABOUT SHARKS! |
|
| What is a Shark? | Shark Information Sheets | Shark Printouts to Color | Evolution of Sharks | Extreme Sharks |
Enchanted Learning®
Over 35,000 Web Pages
Sample Pages for Prospective Subscribers, or click below
|
Overview of Site What's New Enchanted Learning Home Monthly Activity Calendar Books to Print Site Index K-3 Crafts K-3 Themes Little Explorers Picture dictionary PreK/K Activities Rebus Rhymes Stories Writing Cloze Activities Essay Topics Newspaper Writing Activities Parts of Speech Fiction The Test of Time
|
Biology Animal Printouts Biology Label Printouts Biomes Birds Butterflies Dinosaurs Food Chain Human Anatomy Mammals Plants Rainforests Sharks Whales Physical Sciences: K-12 Astronomy The Earth Geology Hurricanes Landforms Oceans Tsunami Volcano |
Languages Dutch French German Italian Japanese (Romaji) Portuguese Spanish Swedish Geography/History Explorers Flags Geography Inventors US History Other Topics Art and Artists Calendars College Finder Crafts Graphic Organizers Label Me! Printouts Math Music Word Wheels |
Click to read our Privacy Policy
| Busy Little Brains CD-ROM |
| Search the Enchanted Learning website for: |
ZOOM is a registered trademark of WGBH Educational Foundation. Zoom School is not affiliated with WGBH Educational Foundation.