Geologic Mapping C

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pikachu4919
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Re: Geologic Mapping C

Postby pikachu4919 » September 29th, 2015, 7:14 pm

Does anyone know how to tell the difference between a dip-slip fault and a transform fault when reading a super simple geometric map? Aka just a top view (or even with cross sections) with nothing but strata marked. As far as I can tell the two (when eroded to flat) have identical outcrop patterns, but I'm probably missing something...
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They didn't give these markings on the map?
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Re: Geologic Mapping C

Postby Gemma W » September 30th, 2015, 7:15 am

Does anyone know how to tell the difference between a dip-slip fault and a transform fault when reading a super simple geometric map? Aka just a top view (or even with cross sections) with nothing but strata marked. As far as I can tell the two (when eroded to flat) have identical outcrop patterns, but I'm probably missing something...
Image

They didn't give these markings on the map?
No, I was looking at a practice question that asked to identify the fault just from a basic block diagram. So you can see where the fault is, but I don't know how to tell which direction the displacement of the tilted strata was, since I think both would cause the same pattern.
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Re: Geologic Mapping C

Postby InfiniCuber » September 30th, 2015, 6:14 pm

Does anyone know how to tell the difference between a dip-slip fault and a transform fault when reading a super simple geometric map? Aka just a top view (or even with cross sections) with nothing but strata marked. As far as I can tell the two (when eroded to flat) have identical outcrop patterns, but I'm probably missing something...
Image

They didn't give these markings on the map?
No, I was looking at a practice question that asked to identify the fault just from a basic block diagram. So you can see where the fault is, but I don't know how to tell which direction the displacement of the tilted strata was, since I think both would cause the same pattern.
Could you possibly upload a picture of it so we can understand better? :D
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Re: Geologic Mapping C

Postby Magikarpmaster629 » September 30th, 2015, 6:18 pm

No, I was looking at a practice question that asked to identify the fault just from a basic block diagram. So you can see where the fault is, but I don't know how to tell which direction the displacement of the tilted strata was, since I think both would cause the same pattern.
Can you link this problem? If it's giving you a block diagram, you could look at the layers and figure out which direction it's going, but with just a geologic map and no symbols, it would be harder.
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Re: Geologic Mapping C

Postby Gemma W » October 1st, 2015, 9:33 am

The question is part of a random powerpoint that I have, not sure where it came from and not sure how to link just that slide...but the idea was to draw the rest of the block diagram from just the geologic map. But I looked closer and realized there was a tiny dip symbol along the fault, so that answers my question. Still, it's interesting that strike-slip and dip-slip faults cause basically the same outcropping patterns, never thought about that before. Thanks for the feedback, I wouldn't have noticed the fault symbol if I hadn't been reminded of it :)
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Re: Geologic Mapping C

Postby liberalartslover » October 1st, 2015, 11:24 pm

I would think with a cross section you would be able to see the offset strata layers in the dip/slip fault but with just a top view there wouldn't be a difference.

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Re: Geologic Mapping C

Postby yasmine7123 » October 15th, 2015, 5:18 pm

So I've done science Olympiad as a middle schooler and now that I'm in highschool my friends have started a SCIOLY team there so we are all new to this and as treasure of the team my job is to get the supplies and I was looking at the geologic compasses and saw that they were a bit pricey and we're pretty tight on money so I was wondering if you guys could send me links to geologic compasses that you guys use for these events that are good but still somewhat cheap. Also do you guys actually use the geologic compass or would it be ok to just use a regular one?

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Re: Geologic Mapping C

Postby yasmine7123 » October 15th, 2015, 5:22 pm

So my friends and I have just started a SCIOLY team at our highschool and I'm in charge of getting supplies so I was wondering if you guys could give me links to good geologic compasses that are somewhat not expensive. Also do you guys actually use the geologic compass or would it be ok to use a normal one?

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Re: Geologic Mapping C

Postby liberalartslover » October 15th, 2015, 6:40 pm

We borrowed one from somebody, a friend of the team works for the USGS so that was convenient. Honestly I wouldn't worry too much about the geologic compass as I've never actually used it in competition.

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Re: Geologic Mapping C

Postby Magikarpmaster629 » October 15th, 2015, 7:17 pm

So my friends and I have just started a SCIOLY team at our highschool and I'm in charge of getting supplies so I was wondering if you guys could give me links to good geologic compasses that are somewhat not expensive. Also do you guys actually use the geologic compass or would it be ok to use a normal one?
Geologic compasses are new to Geologic Mapping this year, and they are not very different from normal compasses; buying an expensive one would not be worth it. I'd say get a basic compass that is accurate, or use one that you have.
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