Hello, I have a question... While taking a break from a hike in the north Rockie

Question

Hello, I have a question...

While taking a break from a hike in the north Rockies with a fellow geology enthusiast, you notice that the boulder you are sitting on is part of a deposit that consist of a jumbled mixture of many different sediment sizes. Since you are in an area that once extensive valley glaciers, your colleague suggest that the deposit must be glacial till. Although you know this is certainly a good possibility, you remind your companion that other processes in mountain areas also produce unsorted deposits. What might such a process be? How might you and your friend determine whether this deposit is actually glacial till?

Thank you very much :)

Explanation / Answer

The oldest sedimentary rock in the Rockies was deposited about 1.7 billion years ago. This rock is typically argillite, very hard mud but it is now found at the northern end of the Rockies on the other hand it is not found in ranges west of the Rockies. Now, there are a lot of coarse sedimentary rock, mostly gritstone which is an evidence of undersea landslides, sandstone and shale, it was deposited in the widening sea produced by the pulling apart. The gritstone, sandstone and shale are the old clastic unit( clastic means rock made of particles eroded from one place and transported to another by water, gravity, glacial ice or wind also eight to nine kilometres thick). Some of these deposits are glacial, because the world was go through greatest ice age. This very cold period lasted around 220 million years. At times, all the continents were sheltered by glaciers and almost all the sea may have been frozen.

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