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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

Shark Glossary
A B C D E F G H I J K L M N O P Q R S T U-Z

Click on an underlined word for more information on that subject.
If the shark or shark term you are looking for is not in the dictionary, please e-mail us.

SEDIMENTARY ROCK

Most fossils are excavated from sedimentary rock layers. Sedimentary rock is rock that has formed from sediment, like sand, mud, small pieces of rocks. Over long periods of time, these small pieces of debris are compressed (squeezed) as they are buried under more and more layers of sediment that piles up on top of it. Eventually, they are compressed into sedimentary rock. It is made of strata, or layers. The layers that are farther down in the Earth are older than the top layers.

Most sedimentary rock layers are buried under soil or other rocks. The easiest way to find fossils is to find exposed sedimentary rock outcroppings. Good places to look include cliffs, river banks, road cuts, quarries, and desert badlands where erosion is escalated.

Some types of sedimentary rock include: Sedimentary rock layers that were formed in water frequently has ripple marks. Sedimentary rock layers that have crackles from drying mud were formed in shallow water that evaporated. Knowing the environmental conditions at the time the rock was formed tells you a lot about what type of fossils may be within the rock layer.





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