otseng wrote:goat wrote:
There are two answers.. one.. when the paralle layers formed it WAS flat, and the techonic plate movement bent the rock over time. This seems the typical way things are distorted
Tectonic forces should have constantly been acting during the formation of all stratas. So, shouldn't we see evidence of the bending of stratas at one mid-sequence layer and below? Instead of just the bending of the entire strata sequence?
I realize I am very late getting into this thread, so my apologies if I am bringing up old issues.
What do you mean by "constantly acting"? It seems to me that tectonic forces can be local in both space and time, or at least the effects of these forces can be local. We see subsidization along faults but not in the middle of plates. We might have volcanic activity along in an area due to tectonic forces at one time in a particular location but not others.
For example, Yellowstone Park has experienced massive lava flows in the past, but is not experiencing any eruptions now.
Also (I just learned this during a recent visit) there are two areas of the park that are now experiencing uplift, but the area of these uplifts is certainly under 20% of the whole park.
So, it seems to me that while tectonic forces are always in operation and could be considered "constant" from that viewpoint, there effects are far from constant in the sense that only certain areas at certain times showing discernible effects.
otseng wrote:The next way is that a thin layer sticks to the sides of hills and dales. It depends on how big the slopes are. IF they are reasonable shallow, then the cohesion of the layer overcomes the potential of gravity.
I question that this would be able to form parallel statas. Especially those of any significant size in area or height.
I have know knowledge of how non-horizontal layers might form.
However, again on a recent trip, I observed many instances of layers that are not now horizontal, some at nearly 45 degrees. These areas had many many layers that were visible, sometimes well over 100 feet in thickness. It seems to me that the layers could have (and probably did) form over long periods and then were subsequently tilted due to tectonic forces.
In some areas, there was quite a bit of color and texture variability in the layers. I have a hard time understanding how a single flood event could so carefully sort colors into layers so that we have a sequence of redish layers, then a sequence of tan layers, then a sequence of gray, and then more red layers, etc.
How can a single flood account for, say, two similar red layers with intervening layers of other colors? Why wouldn't the red be mixed in throughout the whole deposit, or, if it is say heavier rock, be all at the bottom?
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