Identifying rocks
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1) The document identifies 5 different rocks: slate, sandstone (identified for 3 different rocks), and pumice. 2) For each rock, the document describes the texture, color, and sometimes location where the rock was found to help identify what type of rock it is. 3) Additional context is provided about the geological background of the Santa Monica Mountains and areas around Pyramid Lake where some of the rocks were discovered.
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1) The document summarizes the identification of 5 different rock specimens found in California. Specimen 1 was identified as slate based on its smooth texture and deep grey color. Specimen 2 was identified as pumice based on its light weight, hardness, and off-white to greenish color. Specimen 3 was identified as sandstone based on its fine grains, tan to pink color, and origin in terrestrial areas. Specimen 4 was also identified as sandstone based on questions about its crystal grains, layers, and texture. Specimen 5 was easily identified as sandstone based on its grainy yet smooth texture, light pink to deep tan coloring, and origin.
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This document provides examples and descriptions of different types of rocks, including sedimentary (shale, sandstone, limestone), igneous (basalt, granite), and metamorphic (marble). The sedimentary rocks were described as being formed from layers of sand and mud 130-150 million years ago in Napa, CA. The igneous basalt was seen in Hawaii near a volcano and is estimated to be 23,000 years old. Granite was observed in Stanislaus National Forest with a coarse texture. Tennessee marble found in city hall was formed 4600 million years ago from bryozoan accumulations. Limestone in Hayward, CA city hall is 450 million years old Kasota stone
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The document describes three main types of rocks: igneous, metamorphic, and sedimentary. It provides examples of specific rock types within each category, including basalt, diorite, and pegmatite as igneous rocks; slate as a metamorphic rock; and breccia as a sedimentary rock. For each rock example, a brief physical description and sample location is given. The document serves to educate about different rock types through examples and descriptions.
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Identifying rocks
- 1. Identifying Rocks By Rachel Carter
- 2. Rock # 1 And the winner is Slate! Step 1: Texture While examining this rock I found that the surface had a very fine texture. This in itself means that the grain size is also very fine. This grain size is also a foliated texture. Step 2: Color Slate can also range from light to dark grey or nearly black which this rock tended to be.
- 3. Rock # 2 And the winner is Sandstone! Step # 1: Texture/Color/Area While examining this rock I felt the texture to be smooth but I could feel the small grains across its surface. While looking online to help in my search to identify this rock I discovered a website called How to Identify Sandstone on eHow.com here it told me to look at the color which could range from a tan to a deeper bronze color because it contained feldspar which is a dark amber. Along with that it identified the exact area of which I found it. This rock originated in the mountains near Pyramid lake and therefore a terrestrial area.
- 4. Geological B background The Santa Monica mountains have a great geological background to them. They were formed by the movements caused by the Northern and pacific plates. They have their own fault that has caused its own interruptions which is the Malibu Coast fault. The pacific Plate’s boundary is made up mostly of basalt. This plate is mostly oceanic.
- 5. Rock # 3 And the winner is Sandstone! Step # 1: Texture At first I could not figure out what this rock was I even though it could be granite but the color was off. Then when I went to sandstone it had a fine texture but I could feel the individual grains which made me start to think about sandstone. The color had that deep amber in it that can be seen in sandstone.
- 6. Rock # 4 Step # 1: Texture Sandstone may seem in some ways a bit of a jump for this rock but it all added up in the end. By looking carefully at the layers which presented themselves and the texture of the grains against my fingers I found that this rock had the same sandy texture as sandstone. It was found along the hills of Pyramid lake amidst the Grapevine. The color proved to be similar to that of sandstone as well. It held hints of pink along the layers and was mostly a light shade of tan. And the winner is Sandstone!
- 7. Geological Background Pyramid lake located within the Grapevine was created when a ridge was cut through to create a highway. The lake was name after that rock formation. The lake is one of the deepest in the California water projects. It is based off of pyramid dam on Piru creek near Castaic.
- 8. Rock # 5 Step # 1: Texture I could not place which rock this was so my first choice was pumice. Pumice ranges in color from white to greenish and I could see both of those colors in this rock. It also has a glassy texture and is slightly opaque. This rock also has the hard edges and is fairly light in weight. Which all lead to pumice. The only thing that does not lead to pumice is the holes that are in the rock. And the winner is Pumice!