Rock Cutting by DMME Geologists

Thin sections of rock are one tool our geologists use to make better maps. They provide the detail needed to make decisions about how and where to portray the rock units studied. These layers also allow for more meaningful scientific observations and interpretations both in the map and in the text descriptions that accompany the map.

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Video Transcript (approximately)

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Kind: captions
Language: en

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this<00:00:00.420> video<00:00:00.750> shows<00:00:01.079> you<00:00:01.110> in<00:00:01.380> part<00:00:01.680> how<00:00:01.890> rocks

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this video shows you in part how rocks
 

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this video shows you in part how rocks
are<00:00:02.429> prepared<00:00:02.820> for<00:00:03.030> view<00:00:03.270> under<00:00:03.540> a<00:00:03.570> microscope

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are prepared for view under a microscope
 

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are prepared for view under a microscope
we'll<00:00:05.970> start<00:00:06.240> with<00:00:06.359> the<00:00:06.450> oil<00:00:06.480> saw<00:00:08.120> this<00:00:09.120> is<00:00:09.300> our

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we'll start with the oil saw this is our
 

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we'll start with the oil saw this is our
technician<00:00:10.050> bill<00:00:10.290> he's<00:00:10.620> clamping<00:00:11.099> in<00:00:11.280> the

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technician bill he's clamping in the
 

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technician bill he's clamping in the
rock<00:00:11.610> in<00:00:12.049> preparation<00:00:13.049> for<00:00:13.080> cutting<00:00:13.679> it<00:00:13.799> with

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rock in preparation for cutting it with
 

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rock in preparation for cutting it with
that<00:00:14.160> circular<00:00:14.730> saw<00:00:15.000> blade<00:00:15.440> it's<00:00:16.440> important

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that circular saw blade it's important
 

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that circular saw blade it's important
that<00:00:16.890> he<00:00:17.310> clamps<00:00:18.090> it<00:00:18.210> in<00:00:18.359> so<00:00:18.630> the<00:00:18.750> rock<00:00:18.930> remains

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that he clamps it in so the rock remains
 

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that he clamps it in so the rock remains
steady<00:00:19.740> as<00:00:20.010> it's<00:00:20.699> being<00:00:20.910> cut<00:00:21.529> the<00:00:22.529> oil<00:00:22.560> saw<00:00:23.039> is

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steady as it's being cut the oil saw is
 

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steady as it's being cut the oil saw is
generally<00:00:24.090> used<00:00:24.390> to<00:00:24.510> cut<00:00:24.810> flat<00:00:25.500> slabs<00:00:25.980> from

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generally used to cut flat slabs from
 

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generally used to cut flat slabs from
bigger<00:00:26.580> rocks<00:00:26.939> rocks<00:00:27.390> that<00:00:27.599> are<00:00:27.750> too<00:00:27.900> big<00:00:28.080> to

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bigger rocks rocks that are too big to
 

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bigger rocks rocks that are too big to
be<00:00:28.410> cut<00:00:28.619> on<00:00:28.650> other<00:00:28.949> saws<00:00:29.929> he<00:00:30.929> has<00:00:31.050> to<00:00:31.230> close<00:00:31.470> the

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be cut on other saws he has to close the
 

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be cut on other saws he has to close the
lid<00:00:31.920> to<00:00:32.099> keep<00:00:32.130> the<00:00:32.309> oil<00:00:32.640> contained

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now<00:00:37.280> he's<00:00:37.610> turned<00:00:37.940> on<00:00:38.120> the<00:00:38.270> saw<00:00:38.480> blade<00:00:38.840> and<00:00:39.170> he

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now he's turned on the saw blade and he
 

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now he's turned on the saw blade and he
loosened<00:00:40.040> the<00:00:40.129> knob<00:00:40.340> that<00:00:40.699> will<00:00:40.969> allow<00:00:41.329> that

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loosened the knob that will allow that
 

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loosened the knob that will allow that
weight<00:00:41.960> to<00:00:42.620> pull<00:00:42.949> the<00:00:43.550> rock<00:00:43.790> toward<00:00:44.300> the<00:00:44.420> blade

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weight to pull the rock toward the blade
 

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weight to pull the rock toward the blade
in<00:00:44.989> order<00:00:45.379> to<00:00:45.500> cut<00:00:45.680> it

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you<00:00:49.150> may<00:00:49.270> notice<00:00:49.630> the<00:00:49.810> oil<00:00:49.990> everywhere<00:00:50.560> the

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you may notice the oil everywhere the
 

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you may notice the oil everywhere the
oil<00:00:51.730> saw<00:00:51.910> is<00:00:51.970> called<00:00:52.090> an<00:00:52.450> oil<00:00:52.570> saw<00:00:52.900> because<00:00:53.290> it

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oil saw is called an oil saw because it
 

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oil saw is called an oil saw because it
uses<00:00:53.739> oil<00:00:54.040> as<00:00:54.220> a<00:00:54.250> lubricant<00:00:54.910> this<00:00:55.840> stops<00:00:56.170> heat

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uses oil as a lubricant this stops heat
 

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uses oil as a lubricant this stops heat
caused<00:00:57.100> by<00:00:57.309> friction<00:00:57.630> from<00:00:58.630> shattering<00:00:59.140> the

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caused by friction from shattering the
 

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caused by friction from shattering the
blade<00:00:59.530> or<00:01:00.370> otherwise<00:01:01.360> damaging<00:01:01.989> it<00:01:03.780> this<00:01:04.780> saw

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blade or otherwise damaging it this saw
 

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blade or otherwise damaging it this saw
blade<00:01:05.080> does<00:01:05.560> not<00:01:05.770> have<00:01:06.010> teeth<00:01:06.280> like<00:01:06.580> a<00:01:06.610> blade

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blade does not have teeth like a blade
 

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blade does not have teeth like a blade
that<00:01:07.240> would<00:01:07.360> be<00:01:07.479> used<00:01:07.690> to<00:01:07.810> cut<00:01:08.020> wood<00:01:08.290> but

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that would be used to cut wood but
 

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that would be used to cut wood but
instead<00:01:09.550> uses<00:01:09.820> commercial<00:01:10.270> grade<00:01:10.690> diamonds

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instead uses commercial grade diamonds
 

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instead uses commercial grade diamonds
to<00:01:11.440> grind<00:01:11.740> down<00:01:12.010> the<00:01:12.070> rock<00:01:14.130> so<00:01:15.130> he's<00:01:15.340> made<00:01:15.610> one

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to grind down the rock so he's made one
 

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to grind down the rock so he's made one
cut<00:01:16.210> but<00:01:16.630> he<00:01:16.660> still<00:01:17.170> needs<00:01:17.530> a<00:01:17.740> flat<00:01:17.979> slab<00:01:18.340> so

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cut but he still needs a flat slab so
 

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cut but he still needs a flat slab so
he'll<00:01:18.850> make<00:01:19.060> another<00:01:19.420> cut

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here's<00:01:26.700> the<00:01:26.939> finished<00:01:27.299> slab<00:01:27.740> this<00:01:28.740> part<00:01:29.100> will

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here's the finished slab this part will
 

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here's the finished slab this part will
be<00:01:29.430> cut<00:01:29.640> down<00:01:29.670> further<00:01:30.299> the<00:01:31.290> other<00:01:31.439> parts<00:01:31.799> of

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be cut down further the other parts of
 

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be cut down further the other parts of
the<00:01:32.009> rock<00:01:32.189> will<00:01:32.400> be<00:01:32.520> saved<00:01:32.820> for<00:01:33.150> different

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the rock will be saved for different
 

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the rock will be saved for different
analyses

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for<00:01:38.000> now<00:01:38.120> he's<00:01:38.450> going<00:01:38.720> to<00:01:38.810> wash<00:01:39.080> the<00:01:39.380> rocks

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for now he's going to wash the rocks
 

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for now he's going to wash the rocks
just<00:01:40.760> to<00:01:40.880> minimize<00:01:41.060> mess<00:01:41.870> in<00:01:42.140> the<00:01:42.260> lab<00:01:42.440> we

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just to minimize mess in the lab we
 

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just to minimize mess in the lab we
don't<00:01:42.950> want<00:01:43.130> oil<00:01:43.490> all<00:01:43.970> over<00:01:44.000> the<00:01:44.510> other

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don't want oil all over the other
 

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don't want oil all over the other
equipment<00:01:45.560> or<00:01:45.710> on<00:01:45.830> the<00:01:45.950> tables<00:01:46.370> so<00:01:47.120> we<00:01:47.300> even

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equipment or on the tables so we even
 

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equipment or on the tables so we even
put<00:01:47.690> them<00:01:47.810> in<00:01:47.930> the<00:01:48.020> dishwasher<00:01:48.680> to<00:01:48.830> get<00:01:48.979> them

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put them in the dishwasher to get them
 

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put them in the dishwasher to get them
really<00:01:49.400> clean

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now<00:01:54.700> bill<00:01:54.970> is<00:01:55.000> looking<00:01:55.510> for<00:01:55.690> features<00:01:56.050> in<00:01:56.230> the

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now bill is looking for features in the
 

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now bill is looking for features in the
rock<00:01:56.500> he<00:01:56.740> would<00:01:56.890> like<00:01:57.040> to<00:01:57.070> see<00:01:57.400> up<00:01:57.550> close<00:01:58.200> these

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rock he would like to see up close these
 

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rock he would like to see up close these
could<00:01:59.440> be<00:01:59.560> mineral<00:01:59.950> alignments<00:02:00.520> or<00:02:00.640> other

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could be mineral alignments or other
 

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could be mineral alignments or other
clues<00:02:01.150> that<00:02:01.420> can<00:02:01.570> help<00:02:01.750> us<00:02:01.930> figure<00:02:02.110> out<00:02:02.260> the

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clues that can help us figure out the
 

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clues that can help us figure out the
geologic<00:02:03.040> history<00:02:03.220> of<00:02:03.580> this<00:02:03.730> rock<00:02:04.320> the

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geologic history of this rock the
 

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geologic history of this rock the
rectangle<00:02:05.950> he's<00:02:06.250> tracing<00:02:06.550> around<00:02:06.820> is<00:02:07.180> what<00:02:07.360> he

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rectangle he's tracing around is what he
 

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rectangle he's tracing around is what he
will<00:02:07.600> cut<00:02:07.840> out<00:02:07.990> on<00:02:08.200> the<00:02:08.320> water<00:02:08.530> saw<00:02:13.770> this<00:02:14.770> is

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will cut out on the water saw this is
 

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will cut out on the water saw this is
the<00:02:15.010> water<00:02:15.340> saw<00:02:15.720> it<00:02:16.720> uses<00:02:17.170> water<00:02:17.380> to<00:02:17.650> cool<00:02:17.830> down

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the water saw it uses water to cool down
 

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the water saw it uses water to cool down
the<00:02:18.100> blade<00:02:18.460> and<00:02:18.700> to<00:02:18.820> prevent<00:02:19.180> dust<00:02:19.390> from

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the blade and to prevent dust from
 

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the blade and to prevent dust from
becoming<00:02:20.050> airborne<00:02:21.000> this<00:02:22.000> saw<00:02:22.270> blade<00:02:22.300> is

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becoming airborne this saw blade is
 

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becoming airborne this saw blade is
another<00:02:23.110> diamond<00:02:23.650> blade<00:02:23.860> and<00:02:24.130> does<00:02:24.310> not<00:02:24.460> have

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another diamond blade and does not have
 

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another diamond blade and does not have
teeth<00:02:25.320> nonetheless<00:02:26.320> bill<00:02:27.160> is<00:02:27.280> always<00:02:27.490> careful

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teeth nonetheless bill is always careful
 

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teeth nonetheless bill is always careful
to<00:02:28.120> keep<00:02:28.300> his<00:02:28.510> fingers<00:02:28.930> out<00:02:29.170> of<00:02:29.320> its<00:02:29.470> path

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here's<00:02:37.600> the<00:02:37.840> finished<00:02:38.020> product<00:02:38.410> we<00:02:38.950> call<00:02:39.160> this

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here's the finished product we call this
 

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here's the finished product we call this
a<00:02:39.400> billet<00:02:39.910> it<00:02:40.390> will<00:02:40.540> be<00:02:40.660> shipped<00:02:40.930> off<00:02:41.110> to<00:02:41.350> a<00:02:41.380> lab

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a billet it will be shipped off to a lab
 

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a billet it will be shipped off to a lab
and<00:02:42.040> mounted<00:02:42.910> on<00:02:43.030> a<00:02:43.060> glass<00:02:43.300> slide<00:02:43.750> to<00:02:44.020> create<00:02:44.260> a

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and mounted on a glass slide to create a
 

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and mounted on a glass slide to create a
thin<00:02:44.530> section<00:02:44.770> like<00:02:45.160> the<00:02:45.310> one<00:02:45.460> seen<00:02:46.030> here

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thin section like the one seen here
 

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thin section like the one seen here
geologists<00:02:47.920> can<00:02:48.070> look<00:02:48.220> through<00:02:48.340> a

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geologists can look through a
 

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geologists can look through a
petrographic<00:02:48.910> microscope<00:02:49.180> to<00:02:49.960> see<00:02:50.110> the

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petrographic microscope to see the
 

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petrographic microscope to see the
minerals<00:02:50.590> that<00:02:50.740> make<00:02:50.950> up<00:02:51.130> the<00:02:51.280> rock<00:02:51.460> the<00:02:52.180> rocks

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minerals that make up the rock the rocks
 

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minerals that make up the rock the rocks
composition<00:02:53.170> and<00:02:53.380> its<00:02:54.220> orientation<00:02:54.730> may

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composition and its orientation may
 

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composition and its orientation may
provide<00:02:55.480> clues<00:02:55.540> about<00:02:56.140> its<00:02:56.290> formation<00:02:56.650> in

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provide clues about its formation in
 

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provide clues about its formation in
history<00:02:57.430> here's<00:02:58.270> what<00:02:58.480> a<00:02:58.510> thin<00:02:58.750> section<00:02:58.990> looks

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history here's what a thin section looks
 

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history here's what a thin section looks
like<00:02:59.650> under<00:02:59.950> a<00:02:59.980> microscope<00:03:00.810> here's<00:03:01.810> what<00:03:02.020> it

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like under a microscope here's what it
 

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like under a microscope here's what it
looks<00:03:02.290> like<00:03:02.440> under<00:03:02.710> cross<00:03:02.980> polarized<00:03:03.610> light

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looks like under cross polarized light
 

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looks like under cross polarized light
thank<00:03:05.650> you<00:03:05.830> for<00:03:06.010> watching