Sedimentary: Shale/SandstoneThis is an example of the sedimentary rocks: shale and sandstone. This was taken in Napa, CA at LakeBerryessa. These rocks are said to have formed about 130-150 million years ago. This was during theMesozoic age. Lake Berryessa is full of these types of rocks. The sandstone and shale at LakeBerryessa has been formed from layers of sand and mud. As you can see, the sedimentary rock isclastic, meaning its fragmental.
Igneous: BasaltThis is a picture I took while in Hawaii with my aunt a few years back. We were on an island by theKilauea volcano. I believe its basalt? I found this rock very weird and I loved the colors of it when itwas hit. I read that the oldest dated rocks they have on the island is 23,000 years old. As you wouldimagine, most of the island is covered in basalt rock and some obsidian. My aunt believes there couldbe some titanium inside the rock. I dont know what minerals there are exactly. There could be someolivine or pyroxene in there. The texture is obviously very course and parts of it were breaking off.
Igneous: GraniteThis picture was taken near a campground in the Stanislaus National Forest. The place is known for itsvolcanic and granite rocks. Pictured above is an example of the granite. Its very course in texture andhad a very dark coloring to it, as did most of the granite up there. Ive been going to this campgroundfor years and this rock has been in the same position. Its being held up by that tiny rock and if it wereto move, it would fall down. Ive tried researching the rocks in the area but could not find the age ofthem. But as I mentioned before, Stanislaus is filled with granite rocks and this was one of the manyinteresting ones that I found. This is pretty much what Stanislaus looks like!
Metamorphic: MarbleI didnt find any metamorphic rocks in the field. Im sure I wasnt being observant enough, but I wentdown to city hall and noticed they had this beautiful marble flooring. This marble is called Tennesseemarble. It can be found in the Appalachian Ridge-and-Valley Province between the Blue RidgeMountains and the Cumberland Plateau. It was formed from an accumulation of bryozoan 4600 millionyears ago during the Ordovician period. Doing more research on this type of marble, I found out that itisnt marble to some people. It can be classified as a limestone depending on who you ask.
Sedimentary: LimestoneThis is limestone found at the City Hall in Hayward, CA where I live. Because of this, I cant exactlytalk about the types of rocks I found in the area, but I did research on the type of limestone it is andwhere it came from. This limestone is from Minnesota and is known as Kasota stone. It isapproximately 450 million years old and is rich in dolomite as well as magnesium. It is resistant toweathering and because of this, it is used as a building material. This particular limestone was found inan area where the bedrock is made up of Paleozoic sedimentary rocks near the surface. Caverns andsinkholes are formed from the porous limestone on the topsoil.