[Illustration: Ranger hat]
Pipestone is about as hard as your fingernail.
If the weather is nice, go out and walk the Circle Trail.
Visit the Exhibit Quarry—#16 on the Circle Trail.
Walk to the bottom of the quarry and stop at the rock wall.
Geology is the study of rocks and minerals. Here at Pipestone National
Monument we have three types of rock:
• Pipestone
The type of pipestone found here is called Catlinite.
• Sioux Quartzite
This is the hard pink-colored rock that makes up the cliffs at the
Monument and the historic buildings in Pipestone City. This is
also the rock that the quarriers need to dig through to get to
the pipestone layer.
• Granite
These hard rocks are not from this area but were brought here by
glaciers. Good examples of granite are the Three Maidens.
[Illustration: Estimate how tall you think the quartzite layer is.]
Pipestone: this layer is approximately 1 foot high⇒
Quartzite: this layer is approximately ___ feet high