It's all been explained, ...
Thick Chalk Layers and the Flood: http://www.answersingenesis.org/home/ar ... _chalk.asp
Im really tired of typing things up. If you really want to know God and more about creation vs evolution ... go to www.drdino.com ... download his video's, watch them, and make your own decision.
You do what you like my friend, beleive what you like, its your eternal destiny not mines, so it doesn't worry me.
God Bless and watch those video's, then come and ask questions about Evolution, until then, im not bothered answering questions that have been answered.
Scorpz.