Lab Exercise # 1: Grain Analysis

In site one there was a high proportion of very unspherical rocks. According to this the hypothesis is right, in site two there is a lot more smother rocks medium sized and in site 3 there are very small pebbles which are very smooth and spherical. The pebbles get smoother and rounder while it goes downstream. Due to us only taking about 10 rocks our result may have been not right as there were some pebbles which were largely over sized. Most of the other load is dissolved by solution such as limestone and chalk

3. Which application is used for Step #2 in the hacking process to perform a vulnerability assessment scan?

With our observation of the Shawangunk formation, we see a sedimentary rock formation containing a range of grain size. Such sizes range from pebbles (3cm-5cm), fine-grain sand, and medium-grain sand. There is some grading towards the bottom left of the outcrop known as a reverse grading with some small cross beds present (Figure 2). The grading occurs towards a slight part of the outcrop where we see the grading beginning as fine grain sediments and working up to coarser grain. With moderate sorting we see variations of degree of sorting per bed. As the degree of sorting varies as does the sphericity. The sediment bedding is well seen ranging in sizes of +/--20 cm to 40 cm. This outcrop has thick beds as one can see the basic units with cracks in between each (Figure 3). With mostly tabular beds consisting of sub-angular, and sub-rounded sediments, this outcrop also consists of some ventricular beds (Figure 4). When looking at figure 4, we have a small space of a ventricular bed present. This is because the bed comes in, pinches thicker bedding,

Next, we can see that the rock displays a subtle porphyritic texture with plagioclase comprising the phenocrysts. The overall texture of the surrounding groundmass is granoblastic equigranular. Under thin section we also see a weakly defined foliation evidenced in the preferential alignment of actinolite grains and to a lesser extent chlorite grains. Undulose extinction is also observed in quartz indicating the rock was subject to deformation. The normalized quartz, alkali-feldspar, and plagioclase (QAP) values of this rock indicate that it is classified as a grano-diorite according to the IUGS QAPF classification system which is consistent with the hand sample interpretation.

2. Use the geologic definition of a mineral to determine which of the items listed in Figure 1.1 (p.3 lab book) are minerals and which are not minerals. Put an “X” in the appropriate box.

Determine the relative age each of the geologic structures shown in the geologic cross section below (Figure 9.17) from youngest to oldest; then answer the questions below. As before, a wiggly line running across the geologic cross section indicates an unconformity and a fault is indicated with a bold straight line.

3. Find a mineral in the list with the same density and hardness as your sample.

Analyze results – Assume that your experiment produces results identical to those seen in Table 4, what type of graph would be appropriate for displaying the data and why?

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On the first side of the outcrop the rock when examined was greenish and had small black grains indicative of diorite with hornblende giving the green color. The rock was similar to the outcrop encountered at Hollow rock which also had several fractures parallel although not as many, and that outcrop was also highly weathered. On the other side of the outcrop, the rock was incredibly different. This side was not weathered beyond recognition but

4. Choose one of the geological periods listed in figure 3.8 and find out all you can about it. How are rock formations from that period identified? What are its most characteristic fossils? Where are the best samples of rock from your chosen period?

I want to be in the Anderson Scholars Science program because I want to get better at science and do more in-depth research. The internship in the program sounds like a great experience for me, and the research project seems like it would be good to do some real research and fun to do. I will contribute to the Anderson Scholars by going to all of the field trips and science seminars. I will get good grades in my science classes and take AP science classes. I will work hard to become a good scientist. One of the things I hope to gain from this program is some experience on what its like to be a scientist doing research that isn’t just a premade lab. The Anderson Scholars program can give me the opportunity to find out what areas of science

The fractures contained disk-shaped carbonate globules 20-250 microns across with alternating rims rich in iron and magnesium. The globules, located along the walls of the cracks in ALH84001, formed later than the rock itself.

The types of rocks I used are Shale and Gabbro. Shale is a sedimentary rock that is made up of many thin layers. Some Shale rocks have special properties such as black shale rocks contain organic material that sometimes breaks down to form natural gas or oil. Gabbro is a igneous rock that is formed in the crust when magma cools slowly. The colors of Shale are red, brown, green, gray and black. Also Gabbro is usually black or dark green. Both Shale and Gabbro have the same luster which is earthy and dull. The texture of Shale is smooth but a little rough and Gabbro has a coarse grained texture. The hardness of Shale is three on a Mohs Hardness Scale.

DIATOMITE      Diatomite is a sedimentary rock, that is white and yellowish in color. It is composed of fossilized skeletons of one-celled algae-like plants called diatoms. It is accumulated in marine areas. The Honeycomb sillia structure is useful because of its high absorptive capacity and surface area. It is also very chemically stable.