Rocks: Part IGeology 1Mr. Lawler

By: Dana Caceda

Sedimentary Rocks

This rock is an example of sedimentary rocks. You can find rocks like this one in the Monterey area. This rock happens to be an example of marine sediment if you look closely you will see sea shells in it. This rock is over 10 million years old.

Sometimes in marine sediment you may find fossils like bones from the fish in the sea.

Sedimentary Rocks cont…

This is Franciscan formation radiolargyn Chert. As you can see the top one is green and the bottom one is a reddish color. The top is green because it does not have oxygen and the bottom one is red because it does have oxygen. These rocks are 150 million years old.

These rocks were everywhere in Parkfield. As I was driving up the rocky drive way there were many pieces of this kind of rock up and down it.

Igneous Rocks

These rock off to the right are volcanic rocks. The one on top is a black volcanic gas rock with BIG gas pockets this rock kind of reminds you of pumice and also obsidian. When you see this rock in person you can see the glassy look.

The Rock on the bottom is a basalt gas pocket rock which is an extrusive volcanic rock. The gas pockets are much smaller then the rock above because of the rapid cooling of the lava.

Igneous Rocks cont…

This is granite. All three of those rocks off to the right are granite. The one to the far left is granite and has more quartz in it and is much smoother and the one in the middle is a little darker because it has more darker minerals in it like biotite and hornblende and the one to the far right is more fine with more of the minerals then of the quartz.

Granite can be found at the base of the rock. In California Yosemite is a known to be the place to find Granite.

Granite can also come from the Salinian block, which if the crust carried up from the San Andreas Fault.

Metamorphic Rocks

This rock is an example of a metamorphic rock. It is a Calaveras formation and has some marble in it.

In this rock you can see the change in formation. You can see the layers where heat and pressure have made chemical changes.

Metamorphic rocks can be found in northern California.

Work Cited

All of these rocks were in the location of Parkfield, California. A big thank you to the geologist Andy Snyder for showing me around all the rocks and for all the wonderful information!