Dating rocks from mt st helens
Did each tributary have its own source of flash flood water?
Faced with the impossible task of explaining how all that rock could be removed in one or at most a few flash floods, creationists have concocted the theory that the Grand Canyon formations were originally mud laid down at the time of the biblical Genesis flood, and the canyons were washed out from these mud deposits by water trapped in some fashion and then released as a flash flood after the flood waters receded.
This, they claim, supports their belief that all of the earth's major geological features were brought about by catastrophic events that occurred in a relatively brief period of time. Helens, click here, then click on "Get a Map" and type in latitude = 46.2007 and longitude = -122.1918. The topo map clearly reveals that this washout, described by creationists as a "miniature Grand Canyon," is in fact a large blowout quickly spreading to a wide, shallow channel at the foot of the caldera. This is a 9" x 12" soft cover, 64 page publication with topographic maps and many large color photographs.
They argue that their explanation of the formation of the Grand Canyon is supported by the evidence, whereas evidence indicating that it was formed by slow erosion over millions of years is either missing or contrived by proponents of "evolutionism." However, any reasonable evaluation of the physical evidence shows conclusively that the creationist position is completely without foundation. Helens erupted, one side of the caldera was blown out, and the resulting rush of water from melted snow, plus the blast of hot ash, carved out 300 feet of recently laid loose ash and sediment. For additional information, click on this talk origins faq. The Colorado River is 1450 miles from its source to the Gulf of California.
The documentary shows old photographs from before the eruption dating back to the 1950s, exploring the campgrounds, parks, lakes, and forested areas, now changed forever by the destructive forces of the volcano erupting in 1980. May 18, 1980, the volcano exploded at am, killing 57 people, and destroying 250 homes, 47 bridges, 15 miles of railroad, and 185 miles of highway.
In this respect it is similar to the Mississippi River system.
So why does the Colorado system consist of deep gorges while the Mississippi is essentially flat?
Because the Colorado River has cut into, and is still cutting into, a rising rocky plateau. Angled layers (10 to 15 degrees) of sedimentary rock and interbedded lavas eroded to a horizontal surface prior the deposition of the Tapeats Sandstone.
The geology of this plateau consists of horizontal layers of different kinds of solid rock. The enormous quantities of limestone present would require concentrations of calcium ions and depths of water entirely beyond any possibility of existing at any one time.
Starting at the top and going down, these layers are: Kaibab Limestone: 300 feet thick, formed in a marine environment. Numerous reptile tracks preserved in the sandstone. Siltstones formed from deposits in swamps and lagoons. Abundant fossil evidence of crinoids, brachiopods, bryozoans typical of a warm, shallow clear ocean. They had to be formed slowly over millions of years as microorganisms extracted the dilute concentrations of carbon dioxide present in sea water to form the calcium carbonate which is the main constituent of limestone.