Geologic Mapping C

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Re: Geologic Mapping C

Post by Magikarpmaster629 » November 2nd, 2015, 4:02 pm

lavendercats814 wrote:Hello! I'm new to this event this year, and I was wondering what the rules mean by "geological principles"? Thanks!
Geologic principles refers to Steno's four laws that are used to determine the ages of strata in a geologic cross section, as well as several other laws in geology that seem to be less important. This site http://www.cas.miamioh.edu/limpermuseum ... etime.html explains them well.
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Re: Geologic Mapping C

Post by depo1213 » November 4th, 2015, 7:22 pm

Does anyone know what map is going to be used for regionals and where to obtain them or examples of them.

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Re: Geologic Mapping C

Post by pikachu4919 » November 4th, 2015, 7:49 pm

depo1213 wrote:Does anyone know what map is going to be used for regionals and where to obtain them or examples of them.
First of all, map types aren't specific to specific levels of competition—the same kinds of maps can be used at any level.

One is a topographic map, which shows the elevations and contours of the land from a bird's eye view.

example:
Image

Another is a geologic map (heh heh what this event's named for), which usually shows the patterns of rock formations under the surface.

example:
Image

And then there are other maps too that they could give you that are specific to the types of questions they'll ask, but these are the two main types of maps you would need to know. I mean, most maps are just variations derived from these two kinds of maps.
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Re: Geologic Mapping C

Post by baseo1234 » November 4th, 2015, 9:06 pm

Does any one have any good websites, for extraneous geological features?
Does anyone have any guidelines in performing this event, I have taken Earth Science in the past, but it is my first time doing science Olympiad.

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Re: Geologic Mapping C

Post by InfiniCuber » November 5th, 2015, 6:31 am

baseo1234 wrote:Does any one have any good websites, for extraneous geological features?
Does anyone have any guidelines in performing this event, I have taken Earth Science in the past, but it is my first time doing science Olympiad.
What exactly do you mean by "extraneous geological features"?
As far as "guidelines", I started off by just searching all the topics one by one that are given in the rules, then going in depth with each one.
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Re: Geologic Mapping C

Post by JT016 » December 5th, 2015, 9:10 am

http://rniccage.com/geology/3_point_problem/


Can someone help me out with this problem? I understand most of it (I think) except the last part. How do we know when to make orange marks? I see that we make the mark at the 1st strike's(from the left) intersections points at 600m elevation. But why not when the 3rd intersects the 400m elevation?

EDIT: I was reading the map wrong. Im stupid :|

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Re: Geologic Mapping C

Post by Rob101101 » December 18th, 2015, 4:40 pm

Can someone explain this problem to me? It hits me like a truck full of unknown terminology... I imagine you would want to use a stereonet because it has something to do with cardinal degrees, but I'm not sure where one would get (or make) tracing paper and stereonet prints.

A sandstone bed strikes 067° and dips 21° SE. In the bedding plane, it is observed that
there are slickensides pitching at 58 degrees east. What is the trend and plunge of the
slickensides? (Give trend as an azimuth. No Cardinal Direction needed for plundge.)

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Re: Geologic Mapping C

Post by pikachu4919 » January 13th, 2016, 8:16 pm

Rob101101 wrote:Can someone explain this problem to me? It hits me like a truck full of unknown terminology... I imagine you would want to use a stereonet because it has something to do with cardinal degrees, but I'm not sure where one would get (or make) tracing paper and stereonet prints.

A sandstone bed strikes 067° and dips 21° SE. In the bedding plane, it is observed that
there are slickensides pitching at 58 degrees east. What is the trend and plunge of the
slickensides? (Give trend as an azimuth. No Cardinal Direction needed for plundge.)
Yep, it's a stereonet problem (trust me, I'm not fond of them either), but in terms of getting the stereonet, usually I just print one off the Internet and use regular tracing paper and a pin because you place the tracing paper on top of the stereonet and rotate it around the center (where you use a pin to secure that) to plot the points and planes needed.

And with the terminology, I think it's best to think of it three-dimensionally instead of as vocabulary terms:

Image
Image

The first picture does show the strike as the line on the plane, but it would actually be 30 since the strike in terms of this picture would be the angle between that double-arrowheaded line and north, sort of like measuring a bearing.

An azimuth is basically the angle between north and a contour, kind of like this except think of the altitude dipping down instead of up (as you would be measuring for a slope downhill instead of a star up in the sky). In fact, the strike is basically an azimuth measurement, especially when doing the three-point problem.

Image

Slickensides are geological features that are basically smooth surfaces caused by movement of faults applying pressure to each other, kind of the effect of sandpaper on wood (except neither of the two layers rubbing against each other would be as thin as sandpaper). Do not confuse these with slickenlines, which are grooves in the surface carved out by fault movement.
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Re: Geologic Mapping C

Post by Unome » January 17th, 2016, 12:11 pm

For making a binder for this event, are sheet protectors useful, or will they just take up space? I used sheet protectors in Fossils, but I don't know whether tests in this event will require as much speed as in Fossils.
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Re: Geologic Mapping C

Post by Magikarpmaster629 » January 17th, 2016, 6:59 pm

Unome wrote:For making a binder for this event, are sheet protectors useful, or will they just take up space? I used sheet protectors in Fossils, but I don't know whether tests in this event will require as much speed as in Fossils.
Tests are normally really long, so they could be useful; but unlike Fossils, binders aren't super important. Of course, know what you can about the event, but sheet protectors vs. not will have little effect in the end.
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