Sunday, September 25, 2011

What Lies Beneath: Surficial Geology and Soils

An approximate topo map of our site,
map credit Joseph Snowdon
Surficial Geology of Site #4:
No bedrock is visible on our site or in the immediate surrounding area. However, we know that our site is located on Monkton Quartzite that arose during the Cambrian period.  Some UVM students in a Governor's Institute on Environmental Science and Technology class describe Monkton Quartzite as being composed of "silt, quartz, and traces of iron oxide, which give the rock a maroon-purplish color."











Our soil pit with visible horizons, photo credit
Joseph Snowdon



Soil Pit:
• Visible O, A, B, and B2 horizons
• The O horizon, A horizon, and B horizon all have a relatively acidic pH of 5.5
• The B2 horizon has a pH of 6.5.
• The site is very close to the shore of Niquette Bay, and the soil is dry and extremely sandy. Horizon development is clear based on color and texture. The B and B2 horizons are distinguishable by a slight change in color, and an obvious change in pH.



A sample of each horizon, photo credit Joseph Snowdon