GEY1112_L07_StratigraphicCorrelations_JElyWasinger
docx
keyboard_arrow_up
School
Front Range Community College *
*We aren’t endorsed by this school
Course
1112
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
6
Uploaded by CountAlligator3653
GEY1112
Complete the following heading information (leave nothing blank):
Name: Jay Ely-Wasinger
Date: October 12, 2023
Class/section: GEY1112-C11
Instructor: Kristin Quadracci
Lab Partner(s): Ryder, strapped the camera to
his head and told him to sit still
Lab 7 – Stratigraphic Correlations
Original, completed Lab Notebook pages for the following are included in this
Lab submission:
I. Pre-lab questions
II. Experiment 1
III. Experiment 2
Includes:
Legible photos or scans (with name card and signed) of completed three
colored-pencils sketches as directed
YouTube video requirement
Legible photos or scans (with name card and signed) of worksheets 1 and 2
Stratigraphic Correlations
Please note: for any questions that require additional research, consider using Google
Scholar instead of Google. Also, any information taken/used from a source should be
properly cited.
PRE-LAB QUESTIONS
1.
What types of sediments are you most likely to find close to an ocean beach? Far from a
beach in the deep ocean?
When you’re near an ocean beach, you’re more likely to find sand and pebbles, and the
sediment will get finer as you move deeper into the ocean.
2.
Describe how you can identify periods of transgression and regression given a
stratigraphic column.
When observing a stratigraphic column, you can identify periods of transgression or
regression but the presence of some form of the limestone-shale-sandstone or
sandstone-shale-limestone pattern, which occurs as the energy changes during
transgression and regression of seas and oceans.
3.
Give two reasons (and an example for each) that the thickness of beds varies in
correlated stratigraphic columns.
One reason the thickness in beds varies in correlated stratigraphic columns would be the
conditions of the deposition, for example, if one column was pulled from an area that
was a beach and one several meters away, you’d see less sandstone remains and more
silt or carbonate remains left behind. Another reason thickness in beds could vary could
be that the areas of the columns both experienced different types of weathering and
erosion during formation that could change the thickness of the layers.
4.
What is the difference between a facies and a stratigraphic column?
Facies are physical properties of the rocks that give us information on the depositional
environment. Stratigraphic columns contain different facies within them and are maps of
the depositional environment over time.
Stratigraphic Correlations
EXPERIMENT 1: CREATING A STRATIGRAPHIC COLUMN AND
CROSS-SECTION
Data Sheet
Stratigraphic Correlations
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Experiment 1 Post-Lab Questions
1.
Sketch a stratigraphic column of the “land side” (see Step 5) of the mold after the final
advance of the sea.
5.
Did this experiment represent a transgression or regression event? Explain your
reasoning.
This experiment represents a transgression because the carbonate layer that is found at
the bottom of the ocean started on the seaside and made its way over the land side,
displaying the transgression of the sea.
6.
What is Walther’s Law? How does this experiment demonstrate this law?
Walther’s Law states that
Youtube Link:
https://youtu.be/a_lYsfBTGOI
Stratigraphic Correlations
EXPERIMENT 2: CORRELATING STRATIGRAPHIC COLUMNS
Data Sheet
Table 4: Rock Type Identification
Worksheet 1
Stratum
Worksheet 1
Rock Type
Worksheet 2
Stratum
Worksheet 2
Rock Type
A
Conglomerate
A
Limestone
B
Sandstone
B
Shale
C
Siltstone
C
Siltstone
D
Limestone
D
Sandstone
E
Shale
E
Limestone
F
Sandstone
F
Siltstone
Experiment 2 Post-Lab Questions
1.
In Stratigraphic Correlation Worksheet 1, what facies (column independent) was
deposited farthest from land? Explain your reasoning.
I believe that C would have been deposited furthest from land because the silt-size
grains would have been the easiest to transport.
7.
In Stratigraphic Correlation Worksheet 1, assume stratum E contains natural gas
deposits. The scale on the right-hand side of the worksheet gives depth from the surface
in meters. Stratum A lies at the surface. If you were to drill for natural gas halfway
between Column 1 and 2, how far would you have to drill? Explain your reasoning.
If you were to drill halfway between columns one and two, you would need to drill around
70 meters in order to reach the shale at enough depth to not have to worry about
limestone interference, because the shale is deposited at an angel do to the regression
of the sea during that deposition period.
Stratigraphic Correlations
8.
For Stratigraphic Correlation Worksheet 2, orient yourself using the east-west arrow in
the bottom right corner. Where was the water possibly deepest, towards the east or the
west? Explain your reasoning.
I believe that the water was deepest towards the east, as that is where a majority of the
limestone and shale in the diagram were, which are both good indicators of deep sea
environments.
9.
Identify where the sea level was lowest on Stratigraphic Correlation Worksheet 2.
Explain your reasoning.
I believe sea level would have been the lowest around when facies C was deposited, as
sandstone has the largest grain, which is deposited in lower energy environments.
10. What happens to the sandstone in Stratigraphic Cross Section 2? What is this feature
called? Explain the formation of this feature.
The sandstone in Stratigraphic Cross Section 2 pinches out between column 1 and
column 2. This occurs because transgression is immediately cut by a regression,
causing the sea to flow out again.
Historical Geology. (2020, May 27). Wikibooks,
The Free Textbook Project. Retrieved (7:58 PM,
October 14, 2023) from https://en.wikibooks.org/w/index.php?title=Historical_Geology
&oldid=3693288
Stratigraphic Correlations
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help