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“Chalk deposits are the calcite remaining from the shells of microorganisms: foraminifera and coccolithophores. Evolutionists argue that the Flood model does not allow for the thick layers of chalk found all over the world. Uniformitarian geologists assume that the chalk layers form as the shells of these dead microorganisms fall to the ocean floor and slowly build up. Calculations done by Dr. Ariel Roth suggest that the rate of formation of the chalk layers is not a problem in the time span before the Flood. John Woodmorappe took the 17.5 million cubic kilometers of limestone and chalk that exist in the same layers as chalk beds and calculated that only 4.1% of the earth’s surface would need to be covered with the microorganisms to form the rocks.
The problem is not only how much chalk could have been formed but when it was formed. The chalk deposits sit in a layer that is thought to have been formed during the Flood. The conditions during the Flood (warm water, wind, upwelling, nutrient flow from the land, and decaying animals) would have been ideal for the microorganisms and could have caused a bloom in the populations. Under these conditions, the organisms needed for chalk formation could have grown quite rapidly. The purity of the chalk beds is another testament to the rapid nature with which they formed, a fact that evolutionists have a hard time explaining away. The biblical Flood offers a reasonable explanation for the formation of the thick, pure chalk layers seen around the world.” Evolution Exposed, Second Ed., Can Flood geology explain thick chalk beds? Evolution Exposed, Second Ed., Snelling.