WEBVTT

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Okay, so this is the difference between uh, glacial till,

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which is unstratified,

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and non-glacial till.

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So, hopefully you can see that this uh, gravel here

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is well-stratified.

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There are a lot of sedimentary features here.

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Um, you can see graded bedding.

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You can also see cross bedding.

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Maybe I can just sort of zoom in on that.

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So there's cross bedding right there.

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Very coarse uh, cross bedding.

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However, the stratification or the horizontal layering,

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the general horizontal here,

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indicates that this is not glacial gravel.

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Even though it's approximately the correct size

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and sorting distribution.

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The presence of sedimentary features

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as well as uh, the stratification,

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that's the horizontal layering,

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indicated as not glacial gravel.

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Okay. I'll try and show you glacial gravel a little later.

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So this is uh, glacial till.

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It is gravel that is deposited by a glacier.

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Um, and the identifying characteristics of it

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is well-rounded clasts,

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however they're not really really well-rounded.

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They are definitely rounded to some extent.

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Um, oftentimes there are striations on each individual clast,

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maybe I can show you that later.