the believe we were intelligently designed -- by space aliens.
However, IIRC, one of the co-discoverers of DNA (cant remember the name), eventually decided that aliens planted the first life forms (or something like that), because he understood the DNA and related cellular machinery to be too complex to have arisen spontaneously.
that sounds entirely apocryphal.
No, I probably can't explain angular unconformities. But if they can occur slowly, can they occur quickly?
well, they indicate that the strata were formed sequentially. each new layer requires the every one below it to be entirely solid.
If the land can shift axis slowly can it shift axis quickly?
many of the events that do it ARE quick events, such as earthquakes. but it means that such a thing has to happen before new layers are put on it.
Well, I would tend to think that, at best, AUs make a case that at least two events occurred: one for the layers at the one angle and one for the layers at the other. I fail to see how AUs indicate that all the layers involved are sequential and that every lower layer must be entirely solid before another layer can be deposited on it.
Or have I misunderstood you?
well, it requires a bit of inductive logic. extrapolate it another step.
if we have an angular section, under a flat section, every layer below the flat section had to have been formed before. so they had to be solid, then upturned, then a new layer formed on top.
so if we have more than one of these, and we do, and they happen in different layers, and they do... what does it mean? say we have layers a, b, and c. now, in on place, we have an uncomformity between a and b. so b had to be later than a. now suppose we have another unconformity elsewhere between b and c. so not only does c had to have been formed after b, but after a as well by the commutative proprety.
considering the vast amount of angular unconformities we have occuring at so very many different locations in the geologic column, it stands to reason that the layers were laid down sequentially.