Sedimentary Rock

  Want to Find Out About Sedimentary Rock?
If you don't know much about sedimentary rock you will want to read this to learn more. This is a picture of sedimentary rock, located in the H&K Quarry in Hilltown,PA. In fact, there are tons of sedimentary rock in Pennsylvania.
You can find it used in buildings and streets all over the state. The reason that it's called sedimentary rock is because it is formed from layers of sediments. These rocks usually start forming when silt and clay settle down at the bottom of lakes or oceans. You can see the layers that form in these pictures, and the different colors of layers. Hundreds of years ago this rock was under water and took a very long time to form into a sedimentary rock. Almost every building that you see has more than one kind of rock in it. Sand, which is a sediment, is used for glass windows and cement. Hope you learned a lot!


Note ice formations in sedimentary rock

The Order of Sedimentary Rocks Forming

1. Rock is changed into sediments from wind, water, ice, plants, and chemicals in the environment.
2. Sediments are carried away by moving water or by the wind.
3. When the water or wind carrying the sediments slows down the sediments are deposited.
4. As the layers build up, pressure on the buried material changes the lower layers of sediments into sedimentary rock.
That's how sedimentary rocks are formed!

Common Sedimentary Rocks
You can find some common sedimentary rocks with fossils in them. That's how a lot of scientists find fossils.
Common sedimentary rocks are:
Shale, Limestone, Flint, Breccia, Chalk, Chert, Gypsun, Halite, Sandstone, Coal, and Graphite.
Graphite, is so soft it can easily be scratched with your own fingernail. YIKES!

Limestone containing fossils