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Geologic History

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Geologic History

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  1. “Maeve,” a group of 13, became known as “Western Skunk Cabbage.” We subdivided into 3 smaller groups to study different things around our field sight at Rock Point. One Group studied Zebra Mussels and water quality, another studied the history of the Thrust Fault, and our last group of boys studied poisonous plants. A slight mix-up of words established our new name “Poisonous Pants.” Each sub-group was led by an expert in their field to help us understand the different natural features of Rock Point. ~Maeve, Heather, Mike, Britney, Sydney, Brianna, Sylvia, Sawyer, Ben, Rose, Ellen, Peter and Alan

  2. Geologic History • 600-500 million years ago Sediment was deposited. • 500-400 million years ago mountains form, Thrust Fault pushes older rock on top of younger rock. • Glacial period, carved out Lake Champlain. Ice shaped the outcrops of sedimentary rocks seen today. • The Champlain Thrust is preserved along the lake shore.

  3. Thrust Fault Geology Algae Line Hydrochloric acid test Dolostone Pieces Dolostone Erosion Iberville Shale Dunham Dolostone Lone Rock Tree Core -82 years old Originally deposited as limestone, but through a chemical exchange of calcium to magnesium became Dolostone. Shale is a gray thinly layered class of fine grained sedimentary rock deposited as mud. Iberville Shale

  4. SEM-Iberville Shale Shows significant amounts of Calcium

  5. Poisonous Plants Stinging Nettles Poison Ivy White Baneberry Urishiol the main poison in the plant, reacts with your body’s immune system as it tries to defend itself from the Urishiol oil on your skin. Doll’s eyes is a fruit which contains toxins that will cause cardiac arrest and death Barbs that stick into your skin and release a chemical that reacts with the oils of your skin causing a “stinging, itching and numbing” feeling. Red Baneberry Black Nightshade Many symptoms when consuming toxins. Makes a person very sick, stomach pain, dry mouth, headache, attacks central nervous system etc.. Poisonous to eat- slows the muscles in your heart

  6. Zebra Mussels in Lake Champlain Found In 1993- brought over on bottom of large ships Zebra Mussels are invasive species to Lake Champlain. -Clog water lines -Destroy Habitats -Very Sharp, Bad for tourism Zebra Mussels absorb pollution in the lake. Each is able to filter up to 2 liters of water a day Zebra Mussels on Melosira Because the zebra mussels filter out so much plankton, there are now 14 endangered species in Lake Champlain Able to live and reproduce almost anywhere

  7. Testing Water Quality Brianna and Ellen at Lone rock point taking water samples Water quality was tested in areas where zebra mussels were found and compared to the water quality in areas where there were no zebra mussels. Conductivity at Eagle’s Bay and Lone Rock

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