[Just thinking (OP)]

I'm thinking that pebbles may be originating from this.
Dried and cracked desert ground.PNG (475.78 kB . 535x291 - viewed 1705 times)

[Origin]

I find it difficult to comprehend that they could be of great age and still be around and yet I can't come up with a more recent reason for them being here.

The Canadian shield granite is 2.6 to 3.5 billion years old.

We can find pebbles high in the mountains the mountains erode yet the pebbles do not.

You do not typically find round pebbles at the tops of mountains, you find sharp shards of rock.  In the mountain streams you will find rounder pebbles due to the erosion from water.

I guess if you have never read anything about geology or taken a geology course this can seem difficult.

[Origin]

I'm thinking that pebbles may be originating from this.

I really think you are just trolling now.

No, pebbles do not come from dried out mud...

[Just thinking (OP)]

    I'm thinking that pebbles may be originating from this.

I really think you are just trolling now.

No, pebbles do not come from dried out mud...

No, I'm not trolling. If this cracked surface was covered up by flooding and the cracks filled with sediment and a large event took place this aria may be covered up and be compressed over a great period of time the clay will become rock and when released fragment back into the small portions from where it started. Clay is sediment and most surface rocks are too.

[Just thinking (OP)]

I really think you are just trolling now.

No, pebbles do not come from dried out mud...

Look who would have thought a sedimentary mud pebble.
Sedimentary pebbles..PNG (1428.43 kB . 1069x595 - viewed 1417 times)

[CliffordK]

Clay is sediment and most surface rocks are too.

I'm not sure if that would be true. 

There certainly are sedimentary rocks.  But, there are tons of different types of rocks including granite, metamorphic rocks, igneous rocks, etc.  What is most common in any one location would depend on the geologic region, and the forces that created the surface features.

In many cases sedimentary rock crumbles easily.  Lava can be porous.  Granite can be some of the hardest rock, great to be crushed into small pieces, then tumbled in rivers to make pebbles.

[Just thinking (OP)]

I'm not sure if that would be true. 

Only 65 to 70% of the earth's surface is sedimentary rock so I guess it is unlikely after all.

[Origin]

No, pebbles do not come from dried out mud...

Look who would have thought a sedimentary mud pebble.
 Sedimentary pebbles..PNG (1428.43 kB . 1069x595 - viewed 99 times)

Pebbles can of course come from sedimentary rock.  Pebbles do not come directly from mud.

More trolling it appears....

[Bored chemist]

I'm thinking

https://xkcd.com/285/

[Just thinking (OP)]

Pebbles can of course come from sedimentary rock.  Pebbles do not come directly from mud.

More trolling it appears....

No not trolling. I did say that the pebbles may have originated from this. Notice how I stated ORIGINATED not DIRECTLY. One may wonder just who is doing the TROLLING around here. You really love that word TROLLING, don't you?