Geologic Mapping C

UTF-8 U+6211 U+662F
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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » January 12th, 2019, 1:37 pm

Snayhill wrote:Hello Everyone!

I was just wondering if anyone here know what lines that are not faults in a relative dating/strata diagram are. Here's a link https://d2vlcm61l7u1fs.cloudfront.net/media%2Fd3f%2Fd3f1e735-faac-4704-aa99-61fcf269b020%2FphpIiQrsg.png. I'm specifically talking about "G" in this picture.

Thanks!

What does line G represent? It's not a fault because there isn't any relative motion across it as you can see in line K

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Re: Geologic Mapping C

Postby fabishkf » January 12th, 2019, 8:36 pm

joint
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Re: Geologic Mapping C

Postby bluesm0ke » January 21st, 2019, 8:12 pm

Unome wrote:
UTF-8 U+6211 U+662F wrote:
poonicle wrote:On one test, the formula for true thickness was given as T = Wsin(d) + Hcos(d) where T = true thickness, W = width, H = height, d = dip, whereas on another test, the formula for true thickness was given as T = Wsin(d) where T = true thickness, W = width, d = dip. Which one is the correct formula? I am very confused.

What is height?

(Note that a formula for true thickness can be derived using basic trig in emergencies!)

I would strongly recommend deriving the formula yourself, so you understand how it works. There are several standard formulas for true thickness that cover various situations.


Do you think you could post those formulas here? I'm having a hard time grappling more complex true thickness problems that don't just use the basic formula. thanks

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Re: Geologic Mapping C

Postby Unome » January 22nd, 2019, 12:46 pm

bluesm0ke wrote:
Unome wrote:
UTF-8 U+6211 U+662F wrote:What is height?

(Note that a formula for true thickness can be derived using basic trig in emergencies!)

I would strongly recommend deriving the formula yourself, so you understand how it works. There are several standard formulas for true thickness that cover various situations.


Do you think you could post those formulas here? I'm having a hard time grappling more complex true thickness problems that don't just use the basic formula. thanks

I don't have the third one memorized, and can't seem to find it, but I'm pretty sure it's on one of the test exchange tests.
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Re: Geologic Mapping C

Postby poonicle » January 24th, 2019, 6:45 pm

bluesm0ke wrote:
Unome wrote:
UTF-8 U+6211 U+662F wrote:What is height?

(Note that a formula for true thickness can be derived using basic trig in emergencies!)

I would strongly recommend deriving the formula yourself, so you understand how it works. There are several standard formulas for true thickness that cover various situations.


Do you think you could post those formulas here? I'm having a hard time grappling more complex true thickness problems that don't just use the basic formula. thanks


yeah, i'm not gonna lie, i asked that question before TSTs when i didn't know that much about the event. my accuracy improved a lot when i started drawing stuff out then applying trig as opposed to formulas--i'm not very good at identifying which formula applies to which situation yet, but drawing a picture really, really helps imo

that being said, i found T = w*sin(D - S) where D = dip, S = slope, T = true thickness on one practice test. hope that's helpful
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Re: Geologic Mapping C

Postby fleicol1 » February 14th, 2019, 12:11 pm

What would be a good website for information on all of the fault. I haven't had much luck finding a good one.

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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » February 14th, 2019, 12:14 pm

fleicol1 wrote:What would be a good website for information on all of the fault. I haven't had much luck finding a good one.

There's not just one website with all the info, but here's a start

https://www.usgs.gov/faqs/what-a-fault- ... e_products
https://en.wikipedia.org/wiki/Fault_(geology)
https://www.thoughtco.com/fault-types-w ... ms-3879102

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Re: Geologic Mapping C

Postby l0lit » February 26th, 2019, 4:01 pm

I've seen that there is some discussion on the concept of bed thickness. The only scenario I've seen so far is where T = V cos d where T is true thickness, V is vertical thickness, and d is the angle of dip (as found in this scenario. Are there any other scenarios where the other equations (such as T = V cos d - H sin d ) come into play?
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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » February 26th, 2019, 4:14 pm

l0lit wrote:I've seen that there is some discussion on the concept of bed thickness. The only scenario I've seen so far is where T = V cos d where T is true thickness, V is vertical thickness, and d is the angle of dip (as found in this scenario. Are there any other scenarios where the other equations (such as T = V cos d - H sin d ) come into play?

It's best to just use trig instead of trying to apply an equation in that scenario in my opinion. Other equations would apply if other angles/lengths were given.

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Re: Geologic Mapping C

Postby Unome » February 26th, 2019, 4:46 pm

UTF-8 U+6211 U+662F wrote:
l0lit wrote:I've seen that there is some discussion on the concept of bed thickness. The only scenario I've seen so far is where T = V cos d where T is true thickness, V is vertical thickness, and d is the angle of dip (as found in this scenario. Are there any other scenarios where the other equations (such as T = V cos d - H sin d ) come into play?

It's best to just use trig instead of trying to apply an equation in that scenario in my opinion. Other equations would apply if other angles/lengths were given.

Heh, that's exactly what I was going to say.
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Re: Geologic Mapping C

Postby freed2003 » February 26th, 2019, 11:05 pm

whats the difference between brittle and friable? or are they interchangable?
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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » February 27th, 2019, 4:10 pm

freed2003 wrote:whats the difference between brittle and friable? or are they interchangable?

Brittle is used more often in structural geology and thus this event. According to Wikipedia, friable is used in soft-rock geology and describes the tendency of a solid substance to break insto smaller pieces under duress or contact, especially by rubbing, e.g. sandstone.

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Re: Geologic Mapping C

Postby SciHenry2017 » March 19th, 2019, 4:44 pm

I’m new to this forum so I’m not sure if I am supposed to ask questions on here, but I need help. I don’t know how to solve this problem any help would be great. Thank You!!

You notice a horizontal outcrop of an unfolded stratum with a midline 50 meters below the top of a vertical cliff, with a thickness of 3 meters. After climbing to the top of the cliff to investigate further, you find another outcrop of the stratum on the flat clifftop, 2.6 meters wide.
61. What is the true thickness of this stratum in meters? (3)
62. How far is the midline of the second outcrop from the cliff edge in meters? (2)

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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » March 19th, 2019, 5:22 pm

SciHenry2017 wrote:I’m new to this forum so I’m not sure if I am supposed to ask questions on here, but I need help. I don’t know how to solve this problem any help would be great. Thank You!!

You notice a horizontal outcrop of an unfolded stratum with a midline 50 meters below the top of a vertical cliff, with a thickness of 3 meters. After climbing to the top of the cliff to investigate further, you find another outcrop of the stratum on the flat clifftop, 2.6 meters wide.
61. What is the true thickness of this stratum in meters? (3)
62. How far is the midline of the second outcrop from the cliff edge in meters? (2)

The first thing to do when encountering this kind of picture is drawing a picture and labeling relevant angles and lengths. In this case, you would probably only need to draw a cross section. From there, solve for the angles and remaining lengths using some trig calculations. If you need more help, I can attempt to draw a picture. For 62, you would probably use similar triangles.
Last edited by UTF-8 U+6211 U+662F on March 19th, 2019, 5:26 pm, edited 1 time in total.

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Re: Geologic Mapping C

Postby SciHenry2017 » March 19th, 2019, 5:25 pm

UTF-8 U+6211 U+662F wrote:
SciHenry2017 wrote:I’m new to this forum so I’m not sure if I am supposed to ask questions on here, but I need help. I don’t know how to solve this problem any help would be great. Thank You!!

You notice a horizontal outcrop of an unfolded stratum with a midline 50 meters below the top of a vertical cliff, with a thickness of 3 meters. After climbing to the top of the cliff to investigate further, you find another outcrop of the stratum on the flat clifftop, 2.6 meters wide.
61. What is the true thickness of this stratum in meters? (3)
62. How far is the midline of the second outcrop from the cliff edge in meters? (2)

The first thing to do when encountering this kind of picture is drawing a picture and labeling relevant angles and lengths. In this case, you would probably only need to draw a cross section. From there, solve for the angles and remaining lengths using some trig calculations. If you need more help, I can attempt to draw a picture.


Yes can you draw the picture please? I would really appreciate it. Thank you!
Oh the answers are
61. 1.96-1.97 m
62. 43.3-43.4 m


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