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originally posted by: Degradation33
a reply to: AbstractDreamz
I gotta side with isotope decay rates. Pretty reliable timekeepers.
originally posted by: Degradation33
a reply to: AbstractDreamz
Yes! I get to give another geology answer.
I can actually explain that.
It comes down to how water cut through the sedimentary layers.
The grand is a child geologically speaking. No more than 70 million years old. Oldest parts coincide with the uplift of the Colorado Plateau around the time the dinosaurs died out. The newest portions no more than 6 million years.
It Formed entirely from the process of erosion through billions years of sedimentary layering. All the way down to the basement of granite and schist.
It's a convoluted thing though. The layering of the crust it cut through started being deposited when the area was located adjacent to a tropical southern hemisphere ocean. But they dated all the stidations if the crust anyway. There are precambian rocks and the bulk of it are paleozoic deposits. The sedimentary layers that build up over time.
And because it's mostly sandstone, shale, and limestone, while not the strongest rock, it will only further change by the water that runs down the side.
And also rockslides, another product of water and wind erosion.
The complex intercalation of carbonate and clastic sediments within the Kaibab Limestone reflects the deposition of sediments within a gently sloping continental margin during a period of frequent, high-frequency sea level changes...
Later research concerning conodonts and associated megafossils obtained from western outcrops of the Fossil Mountain Member indicates that its age extends into the Roadian (latest Early Permian and earliest Middle Permian) age
originally posted by: Degradation33
a reply to: AbstractDreamz
I dont want to do that much on the spot research.
So let's say 525,000,000 years of tectonic shift and crust changes that left several layers of sediment.
You can estimate the age when the different formations were deposited.
When all of these sediments were deposited the elevation of the rim wasn't 9000 ft above sea level. It hadn't even been uplifted as part of the North American Plate yet. It was near the equator drifting northwest. All major deposits are from different points in history when that part of the crust was at different parts of the planet.
So I'll give you the top layer:
The Kaibab Limestone.
The complex intercalation of carbonate and clastic sediments within the Kaibab Limestone reflects the deposition of sediments within a gently sloping continental margin during a period of frequent, high-frequency sea level changes...
Later research concerning conodonts and associated megafossils obtained from western outcrops of the Fossil Mountain Member indicates that its age extends into the Roadian (latest Early Permian and earliest Middle Permian) age
So the top layer cut of sedimentary rock was deposited at or around sea level around 270 MYA. The layers just get older from there.
originally posted by: Degradation33
a reply to: AbstractDreamz
I kinda missed your question.
And it's actually really good.
Why don't the sedimentary layers of rock like Calcium Carbonate (limestone) decay within the earth and collapse in.
They do. It erodes on parts exposed to weathering. Most limestone are the argonite or calcite polymorphs of limestone. Put calcite in water and it's gone eventually.
But form it into miles upon miles long meters thick sheets and stack them on other sedimentary sheets and it erodes only where exposed to weathering. Otherwise it's quite structurally stable. Limestone as old as 2.7 billion years has been confirmed.
Limestone when exposed to weathering erodes, when exposed to enough pressure and heat becomes a metamorphic rock called marble.
So a better answer is it is collapsing in on itself in the form of constant erosion of points exposed to the elements. The grand canyon will keep weathering away and get wider over time.
And I get my information from geological encyclopedias and what i remember from college years ago. I just like geology for hobby reasons and read a lot about it.
originally posted by: AbstractDreamz
I would say the vast majority of people subscribe to the idea that the Earth is many millions/billions years old. After becoming a little more religious, the theory of the Earth being approx. 6500 years old is interesting to me.
originally posted by: AbstractDreamz
a reply to: Degradation33
How do you explain what happened to Mt. St. Helens region since 1980, as it defies historical calculations.