otseng
But why did all the layers get formed underwater first, and then the entire sequence got uplifted after all the layers formed? What would cause such an uplift? Why is there no bending or folding evident? How could the entire area have gotten uplifted without bending?
Actually, in this case, it was the sea levels that dropped when the Atlantic ocean started seperating Euope and the North American continent along the Mid-Atlantic ridge(a process that continues to this day)...
"The Chalk of NW Europe was deposited on the continental shelf during the earliest stages of the opening of the Atlantic Ocean (Biscay to Labradore opening at the beginning of Chalk deposition) . The sea level was much higher than the present day with the Chalk of Kent typically being deposited in a depth range of 100-300m. The sea levels varied through its deposition. However, not all Chalk was deposited at this depth with some marginal (shallow) marine deposits being recorded both in Devon and NW France.
The Chalk often shows a distinctive cyclicity (on a 1m or so scale) which has been linked to variation in the climate at the time of deposition (Milankovitch cycles).
The lack of coarser clastic material in the majority of the Chalk, with quartz being most common in the clay size grade, indicates clear seas with minimal eroded products being transported from the landmasses at the time. Indeed, much of the clay sized quartz and clay may be airborn and of volcanic origin."
http://www.geologyshop.co.uk/chalk.htm
Scotracer wrote:
You said virtually all strata were formed in one instant. Chalk takes millions of years to form (and that's a fact) so how is this at all possible?.
It's not a fact. It's a theory.
No, it is a fact, the amount of material indicates hundreds of millions of years, so does the chemical changes that have occurred as well as the radioactive dating. The fossils in the lowest levels are very different from those in upper layers, in fact upper layers contain sharks teeth and crustacean fossil while the lowest layers do not. This indicates the time of formation spanned a time of AT LEAST 200 million years.
The evidence is not as simple as you seem to think, the facts do not support your contentions. Each situation requires it's own evaluation, taking into account the geolocical history of the site. Your simplistic predictions have no basis in reality.
Grumpy
