[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:05.97,0:00:12.67,Default,,0000,0000,0000,,Speaker: Okay, so this is the difference \Nbetween uh, glacial till,
Dialogue: 0,0:00:12.67,0:00:14.57,Default,,0000,0000,0000,,which is unstratified,
Dialogue: 0,0:00:14.57,0:00:16.92,Default,,0000,0000,0000,,and non-glacial till.
Dialogue: 0,0:00:16.92,0:00:21.25,Default,,0000,0000,0000,,So, hopefully you can see \Nthat this, uh, gravel here
Dialogue: 0,0:00:21.25,0:00:23.33,Default,,0000,0000,0000,,is well-stratified.
Dialogue: 0,0:00:23.33,0:00:26.05,Default,,0000,0000,0000,,There are a lot of \Nsedimentary features here.
Dialogue: 0,0:00:26.05,0:00:31.09,Default,,0000,0000,0000,,Um, you can see graded bedding.
Dialogue: 0,0:00:31.09,0:00:33.24,Default,,0000,0000,0000,,You can also see cross bedding.
Dialogue: 0,0:00:33.24,0:00:36.100,Default,,0000,0000,0000,,Maybe I can just sort of zoom in on that.
Dialogue: 0,0:00:36.100,0:00:39.63,Default,,0000,0000,0000,,So there's cross bedding right there.
Dialogue: 0,0:00:39.63,0:00:43.72,Default,,0000,0000,0000,,Very coarse uh, cross bedding.
Dialogue: 0,0:00:43.72,0:00:47.51,Default,,0000,0000,0000,,However, the stratification \Nor the horizontal layering,
Dialogue: 0,0:00:47.51,0:00:49.44,Default,,0000,0000,0000,,the general horizontal here,
Dialogue: 0,0:00:49.44,0:00:53.53,Default,,0000,0000,0000,,indicates that this is not glacial gravel.
Dialogue: 0,0:00:53.53,0:00:55.86,Default,,0000,0000,0000,,Even though it's approximately \Nthe correct size
Dialogue: 0,0:00:55.86,0:00:59.40,Default,,0000,0000,0000,,and sorting distribution.
Dialogue: 0,0:00:59.40,0:01:01.70,Default,,0000,0000,0000,,The presence of sedimentary features
Dialogue: 0,0:01:01.70,0:01:04.76,Default,,0000,0000,0000,,as well as, uh, the stratification,
Dialogue: 0,0:01:04.76,0:01:06.38,Default,,0000,0000,0000,,that's the horizontal layering,
Dialogue: 0,0:01:06.38,0:01:09.72,Default,,0000,0000,0000,,indicated as not glacial gravel.
Dialogue: 0,0:01:09.72,0:01:13.44,Default,,0000,0000,0000,,Okay. I'll try and show you\Nglacial gravel a little later.
Dialogue: 0,0:01:13.44,0:01:16.96,Default,,0000,0000,0000,,So this is uh, glacial till.
Dialogue: 0,0:01:16.96,0:01:20.44,Default,,0000,0000,0000,,It is gravel that is deposited \Nby a glacier.
Dialogue: 0,0:01:20.44,0:01:25.35,Default,,0000,0000,0000,,Um, and the identifying\Ncharacteristics of it
Dialogue: 0,0:01:25.35,0:01:30.42,Default,,0000,0000,0000,,is well-rounded clasts,
Dialogue: 0,0:01:30.42,0:01:34.39,Default,,0000,0000,0000,,however they're not\Nreally really well-rounded.
Dialogue: 0,0:01:34.39,0:01:37.81,Default,,0000,0000,0000,,They are definitely rounded \Nto some extent.
Dialogue: 0,0:01:37.81,0:01:41.25,Default,,0000,0000,0000,,Um, oftentimes there are striations \Non each individual clast,
Dialogue: 0,0:01:41.25,0:01:43.17,Default,,0000,0000,0000,,maybe I can show you that later.
Dialogue: 0,0:01:43.17,0:01:46.27,Default,,0000,0000,0000,,Um, those are scratches that are produced
Dialogue: 0,0:01:46.27,0:01:48.71,Default,,0000,0000,0000,,when gravel bounces or scrapes against
Dialogue: 0,0:01:48.71,0:01:51.24,Default,,0000,0000,0000,,other pieces of gravel or the bedrock.
Dialogue: 0,0:01:51.24,0:01:52.83,Default,,0000,0000,0000,,And the other identifying characteristic
Dialogue: 0,0:01:52.83,0:01:56.81,Default,,0000,0000,0000,,is that the gravel itself \Nis unstratified.
Dialogue: 0,0:01:56.81,0:02:01.57,Default,,0000,0000,0000,,There is no layering, \Nno horizontal stratification.
Dialogue: 0,0:02:01.57,0:02:04.76,Default,,0000,0000,0000,,Um, and there really are \Nno sedimentary features here,
Dialogue: 0,0:02:04.76,0:02:07.42,Default,,0000,0000,0000,,other than the lack \Nof sedimentary features,
Dialogue: 0,0:02:07.42,0:02:11.58,Default,,0000,0000,0000,,which indicates that \Nit was deposited by a glacier.
Dialogue: 0,0:02:11.58,0:02:14.16,Default,,0000,0000,0000,,Now hopefully you'll be able to see,
Dialogue: 0,0:02:14.16,0:02:16.22,Default,,0000,0000,0000,,if it'll focus on that,
Dialogue: 0,0:02:16.22,0:02:21.09,Default,,0000,0000,0000,,the scratches \Non the surface of this clast.
Dialogue: 0,0:02:21.09,0:02:26.44,Default,,0000,0000,0000,,Those parallel scratches \Nare glacial striations,
Dialogue: 0,0:02:26.44,0:02:32.30,Default,,0000,0000,0000,,which are present on a clast.
Dialogue: 0,0:02:38.03,0:02:40.82,Default,,0000,0000,0000,,It's stuck in there pretty hard. Argghh.
Dialogue: 0,0:02:42.77,0:02:44.47,Default,,0000,0000,0000,,It won't come out.
Dialogue: 0,0:02:44.47,0:02:49.24,Default,,0000,0000,0000,,And in addition to the lack of uh, \Nsedimentary features,
Dialogue: 0,0:02:49.24,0:02:54.35,Default,,0000,0000,0000,,um, one of the characteristics \Nthat you always look for
Dialogue: 0,0:02:54.35,0:02:57.14,Default,,0000,0000,0000,,is a very very poor degree of sorting
Dialogue: 0,0:02:57.14,0:02:59.90,Default,,0000,0000,0000,,in terms of clast size.
Dialogue: 0,0:02:59.90,0:03:04.62,Default,,0000,0000,0000,,And so, maybe I can \Nzoom in on that a little bit.
Dialogue: 0,0:03:04.62,0:03:09.55,Default,,0000,0000,0000,,You've got clasts of all different, \Nuh, sizes.
Dialogue: 0,0:03:09.55,0:03:14.28,Default,,0000,0000,0000,,Very poorly distributed.
Dialogue: 0,0:03:14.28,0:03:20.42,Default,,0000,0000,0000,,I suppose even down to these sizes,
Dialogue: 0,0:03:20.42,0:03:26.10,Default,,0000,0000,0000,,which have fallen down \Nfrom the cliff face, I suppose,
Dialogue: 0,0:03:26.10,0:03:29.35,Default,,0000,0000,0000,,the gravel face anyways.
Dialogue: 0,0:03:29.35,0:03:31.50,Default,,0000,0000,0000,,Very poor sorting.
Dialogue: 0,0:03:31.50,0:03:33.36,Default,,0000,0000,0000,,Okay. Since we're talking about till,
Dialogue: 0,0:03:33.36,0:03:36.82,Default,,0000,0000,0000,,I thought I'd show you \Nwhat happens when till, um,
Dialogue: 0,0:03:36.82,0:03:41.31,Default,,0000,0000,0000,,becomes a rock, when it becomes \Nconsolidated or indurated.
Dialogue: 0,0:03:41.31,0:03:45.12,Default,,0000,0000,0000,,This is called tillite, which is uh,
Dialogue: 0,0:03:45.12,0:03:49.69,Default,,0000,0000,0000,,the rock, I suppose, from glacial till, \Na conglomerate.
Dialogue: 0,0:03:49.69,0:03:52.57,Default,,0000,0000,0000,,This one is very old.
Dialogue: 0,0:03:52.57,0:03:56.98,Default,,0000,0000,0000,,It is on the side of \Nthe Trans Canada, here. [cars going by]
Dialogue: 0,0:03:56.98,0:03:58.100,Default,,0000,0000,0000,,As you can tell by the traffic.
Dialogue: 0,0:03:58.100,0:04:03.70,Default,,0000,0000,0000,,And it is south of\NWawa in Ontario, Canada.
Dialogue: 0,0:04:03.70,0:04:08.21,Default,,0000,0000,0000,,[traffic in background]
Dialogue: 0,0:04:08.21,0:04:12.79,Default,,0000,0000,0000,,This particular crop has been \Nhighly metamorphosed,
Dialogue: 0,0:04:12.79,0:04:14.96,Default,,0000,0000,0000,,so these in the Canadian shield.
Dialogue: 0,0:04:14.96,0:04:18.77,Default,,0000,0000,0000,,Um, so strongly metamorphosed.
Dialogue: 0,0:04:18.77,0:04:21.42,Default,,0000,0000,0000,,And this tillite is uh, \Nweathering very rapidly
Dialogue: 0,0:04:21.42,0:04:23.90,Default,,0000,0000,0000,,as a result of the intense metamorphism,
Dialogue: 0,0:04:23.90,0:04:26.51,Default,,0000,0000,0000,,which has caused cracks and fractures
Dialogue: 0,0:04:26.51,0:04:28.78,Default,,0000,0000,0000,,which increase surface area, of course,
Dialogue: 0,0:04:28.78,0:04:30.93,Default,,0000,0000,0000,,and cause weathering to accelerate.
Dialogue: 0,0:04:30.93,0:04:35.87,Default,,0000,0000,0000,,[traffic in background]
Dialogue: 0,0:04:35.87,0:04:37.87,Default,,0000,0000,0000,,Now realize I'm looking at a shadow here,
Dialogue: 0,0:04:37.87,0:04:43.26,Default,,0000,0000,0000,,but hopefully you can see \Nthat the clasts are well-rounded.
Dialogue: 0,0:04:43.26,0:04:48.38,Default,,0000,0000,0000,,Very poorly sorted, \Nin terms of size distribution.
Dialogue: 0,0:04:48.38,0:04:51.01,Default,,0000,0000,0000,,And are not layered.
Dialogue: 0,0:04:51.13,0:04:53.06,Default,,0000,0000,0000,,They are unstratified.
Dialogue: 0,0:04:53.06,0:04:56.28,Default,,0000,0000,0000,,I just thought you might want to see \Nwhat's on the other side of the road.
Dialogue: 0,0:04:56.28,0:04:59.82,Default,,0000,0000,0000,,That is Lake Superior,
Dialogue: 0,0:04:59.82,0:05:04.14,Default,,0000,0000,0000,,about an hour south of Wawa, Ontario.
Dialogue: 0,0:05:04.14,0:05:05.66,Default,,0000,0000,0000,,Pretty big lake, eh?
Dialogue: 0,0:05:05.66,0:05:11.08,Default,,0000,0000,0000,,Kind of looks like the ocean.
Dialogue: 0,0:05:11.08,0:05:12.95,Default,,0000,0000,0000,,You can't see the other side \Nof Lake Superior,
Dialogue: 0,0:05:12.95,0:05:17.08,Default,,0000,0000,0000,,even though we're way the heck up \Non the roadside.
Dialogue: 0,0:05:17.08,0:05:23.11,Default,,0000,0000,0000,,There you can see down to the beach.
Dialogue: 0,0:05:23.11,0:05:24.48,Default,,0000,0000,0000,,Alright, that's it.
Dialogue: 0,0:05:24.48,0:05:27.43,Default,,0000,0000,0000,,Bye for now.