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My Geological Rock Study:A Visit to Mt. Shasta
Part IDava Bryant11/26/2011
Mt. ShastaMount Shasta is a dormant compound
stratovolcano which means it is made up of numerous phases of eruptions that formed
cones that make up the mountain today. It is also part of the Ring of Fire, a series of
volcanoes “that are distributed along the west coast” of North and South America and the East coasts of Asia. 1 It’s formation is the product of “4 relatively brief eruptive episodes” that have occurred over the past 600,000 years.2 What is most interesting about Mount Shasta are the 4
cones that make up its configuration.
Sergeants Ridge Cone is the oldest and is still visible today.
Misery Hill Cone the second oldest “grew atop the glaciated…flank of the first.”3
Shastina, the third cone is free standing about 5 miles away.
Hotlum was formed “since the retreat of large glaciers from the mountain around 6,000 years ago” and makes up a majority of Mt. Shasta’s mass.4
The following chart lists the cones and the lengths of their episodes.
Chart of Eruptive Phases of Cones5
From a more personal perspective Mt. Shasta is just beautiful. It is located about an hour North of
Redding in Northern California. My mom and grandmother live there and I make a trip to the mountain
every time I visit them. Shasta City sits below the mountain and is your
typical small town with an extraordinary view. Here are a
couple more photos.Shastina
Rocks! Rocks! Rocks!
Location of Rock Collection
My daughter, an avid rock collector (she picks them up
anywhere we go) was so excited about helping
mommy collect rocks. All of the rocks we collected were from the area depicted in the picture to the right. In
the background of the picture you can also see a few of the cones that form
Mount Shasta.
Continued in 2nd file…
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