Friday, October 7, 2016

Rock field trip

Marquette is filled with all sorts of beautiful rocks. I have always loved driving through town and seeing the beautiful rock formations. This week we went on a field trip to go an explore these rocks, and we talked about the history behind them. We went to three locations: Near the welcome center, tourist park, and finally presque isle.

At the rock wall across from the welcome center we climbed up to see a rock formation that proves there was ocean life as it is covered in fossils of cynael bacteria algae. We can do relative dating based on this evidence to tell how old the rock is approximately.
In the rocks were evidence of inclusion from the different colored rocks that were blended together




the second location we stopped was at tourist parks. at this location we saw evidence of glacier activity. there were different levels of rocks, and gouges through the rocks to prove the glacier activity. There were different color rocks showing at least two levels of rocks visible showing a different age to those rocks based on the law of superposition . The explanation I liked the most from this stop was the rocks acting a bit like a lava lamp- rocks moving up and solidifying after they cool down. We cant tell the exact age from these rocks because they are not igneous rocks, but again we can do approximate dating.







the third spot we stopped at was presque isle and we saw the sandstone on the beach one of the oldest rocks around here. unfortunately we didn't get to see the blackrocks this time around but they are also a great example of ages of rocks, based on how they ended up in their location. When looking at this location it was easy to spot when there was a different type of rock present because the sandstone was everywhere. However, there were still some samples of younger rocks such as the green stone, as well as some layering seen in the cliff-face.










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