Marin Headland Field Trip Page
Investigation and Research
Virtual Field
Trip to the Marin Headlands:
(pictures for stops are all taken by Heather Marshall)
STOP 1: Look at the pictures from STOP 1. What type of rocks are in these pictures? Where and how does this rock normally form? Why is the rock all twisted and folded? When was the rock twisted and folded- during deposition or after? What is the dark sheen on the hand sample in the last picture? Where might that have formed?
STOP 2: Look at the pictures from STOP 2. What type of rocks do you see in these pictures (2 types)? Where and how do each of them form? What type of boundary is the contact of the two rocks (where the people are)?
STOP 3: Look at the pictures from STOP 3. What type of rock is the main lighter colored rock in these pictures? Where does it normally form? What type of rock is the darker rock, and where does it normally form? What process probably caused this finger of darker rock into the lighter colored rock?
STOP 1: Look at the pictures from STOP 1. What type of rocks are in these pictures? Where and how does this rock normally form? Why is the rock all twisted and folded? When was the rock twisted and folded- during deposition or after? What is the dark sheen on the hand sample in the last picture? Where might that have formed?
STOP 2: Look at the pictures from STOP 2. What type of rocks do you see in these pictures (2 types)? Where and how do each of them form? What type of boundary is the contact of the two rocks (where the people are)?
STOP 3: Look at the pictures from STOP 3. What type of rock is the main lighter colored rock in these pictures? Where does it normally form? What type of rock is the darker rock, and where does it normally form? What process probably caused this finger of darker rock into the lighter colored rock?
STOP 4: Look at the pictures from STOP 4.
What type of
rock is this in these pictures? (look closely at the arch pictures,
these give the best glimpse of fresh rocks) Where do these rocks
normally form and how? How might these rocks have gotten to where
they are now, from where they form?
STOP 5: Look at the pictures from STOP 5. What does it look like happened to form this outcrop?
Analysis:
How might all of these rocks gotten from where they were deposited or formed, to where they are now?
What type of tectonics do you think were prevalent on the Pacific coast around 175 my to about 65 mya, prior to the San Andreas Fault taking over as plate boundary?
Does this type of tectonics explain the features seen in the Marin
Headlands today?STOP 5: Look at the pictures from STOP 5. What does it look like happened to form this outcrop?
Analysis:
How might all of these rocks gotten from where they were deposited or formed, to where they are now?
What type of tectonics do you think were prevalent on the Pacific coast around 175 my to about 65 mya, prior to the San Andreas Fault taking over as plate boundary?
Teacher Key Page
