There are also too many microscopic animals. Most limestone is deposited by bacteria and invertebrate animals. The Austin Chalk, which underlies Dallas, is a 400-foot thick limestone bed made of the remains of microscopic animals, called coccolithophores or coccoliths. It is about 70% coccoliths. The coccolithophore is a small spherical animal, between 5 and 60 micrometers in diameter, each having about 16 coccoliths that separate upon the death. According to Stokes Law these animals would fall through the water at a rate of .1 millimeter per second. To fall through a 100 foot (33 meter) depth of water would take 4 days.
The time required to form the Austin Chalk is far longer than one year. The coccolith skeleton, when pressed flat, is about 1 micron or one millionth of a meter thick. A deposit of coccoliths 400 feet thick must represent many thousands of years of deposits. One hundred twenty-one million coccoliths could be stacked up like coins across the four hundred feet. The length of time necessary to deposit these 121 million coccoliths can be calculated by assuming the maximum density of living coccolithophores in the waters above. Such measurements can be made during an event known as a red tide.
Occasionally, growth conditions become so favorable that they grow beyond all reason. As many as 60 million creatures per liter of water grow and quickly use up all of the oxygen and nutrients in the water and then die. Their decay continues to use any oxygen entering the water and also gives off poisons. Fish who swim into one of these areas often die from lack of oxygen and the absorption of toxins emitted by the dead microorganism. These water blooms last only a few weeks as the microorganisms deplete the water's nutrients rapidly and die. However, even at their most dense, 60 million microorganisms per liter, only 39 layers of organisms are stacked in a single cubic centimeter. Thus, to stack 121 million coccoliths would require the death of nearly 8 million organisms. A 100 foot water depth, filled to the maximum with coccospheres, would only generate a thickness of six feet of chalk! The four hundred feet of chalk of the Austin formation would require 66 such blooms. If it required two weeks between each bloom to recharge the nutrients and one week for the bloom to occur, it would take 4 years to deposit the chalk. And these values are wildly optimistic for the deposition of chalk. This size bloom is not possible.
The coccolithophores remove calcium carbonate from the water to make their skeletons. In water depth of 100 feet there is not nearly enough calcium to deposit such a volume of chalk. One hundred feet of seawater contains only enough carbonate to deposit a little over 1-millimeter of carbonate. Thus, no bloom of the size mentioned above can even occur. Using the two-week recharge and one-week bloom mentioned above, it would take 7,000 years to deposit the chalk. Obviously, the chalk under Dallas would require much more time to deposit than merely one year. In southern Louisiana, the chalk is 2100 feet (640 meters) thick. I have drilled it. This would take considerably more time than seven thousand years.
Additionally, the quantity of chalk seen in the world is far too great to have been contained in the preflood world hypothesized by young-earth creationists. The Austin Chalk is a chalk deposit that stretches from Mexico along the coast of the Gulf of Mexico into Louisiana, a distance in excess of 800 km. In Mexico, the Austin Chalk is named the San Felipe Formation. A glance at the geologic data shows that the band is about 160 km wide and appears to average 120 meters in thickness.43 In the chalk in Texas alone there are enough dead coccolithophores to cover the earth to a depth of 3 centimeters. But Texas is not the only place on earth that has deposits of chalk. In Alabama and Mississippi, the chalk is known as the Selma. The Niobrara chalk - 5,000 km long, 1,400 km. wide and 6 meters thick - runs through much of the western part of the Great Plains of the United States.44 The Niobrara would add another 7 centimeters of cover to the earth. Throughout Europe Upper Cretaceous chalks cover large areas. The White Cliffs of Dover are made of chalk that is as much as 215 meters thick in parts of England. This chalk sweeps across southern Scandinavia, Poland and into south Russia where it attains an amazing thickness of up to 1000 meters. It is stopped by the Ural Mountains. The chalks of western Europe are enough to cover the entire earth to a depth of 83 centimeters.45 West of the Urals, in the Central Asian Tuar-Kyr mountain range, a deposit of chalk 20 meters thick is found. In Israel, Jordan, Egypt, Syria and Saudi Arabia, an Upper Cretaceous chalk is around 180 meters thick. If all the fossil record was the record of the destruction of one preflood biosphere, as Morris suggests, it must have been a crowded place. The worldwide quantity of dead coccoliths would cover the earth to a depth of one meter.
Source: Too Many Fossils for a Global Flood by Glenn R. Morton
http://home.entouch.net/dmd/toomanyanimals.htm
Fascinating read...thanks for that link, as well...