Earth covered with water in the beginning? I have heard a monk saying, in the beginning of this kappa Earth was covered with water. And a god or a brahma, I dont remember exactly whom, had put a lotus seed into that water and there grown 5 flowers and they represented the 5 Buddhas (Kakusanda, Konagama, Kashyapa, Gautama, Meithri) in this kappa. But I could not find where in Tripitaka did the lord Buddha say that. So I highly apreciate if someone could help me to find any reference to this.

Thanks in advance.
I recently discussed this in my blog. Here is a quote:


  The Buddha proceeds to tell Vasettha a cosmogony, a myth about the
  origin of the world and life. The earth was originally entirely
  covered by water, and everything was blinding darkness. There were no
  sun, moon, stars, night, day, months, fortnights, years, seasons, or
  gender. Interestingly, scientists believe that the earth was
  originally a “waterworld,” almost entirely covered by water, about 2.5
  billion years ago. The only life on earth at that time was sexless
  algae and bacteria. After a very long period, a skin formed on the
  surface of the water like the skin that forms over hot milk as it
  cools. In this passage, the Buddha demonstrates that he understands
  that the cause of the one world ocean at that time was the deep mantle
  of the earth, which was 200 degrees hotter than it is now, and also
  that it was cooling. As the deep mantle cooled, the continental crust
  formed must have been as described in the sutta.
  
  During the waterworld era, any oxygen produced by photosynthesising
  bacteria would have been quickly used up through reactions with
  decaying organic matter in the oceans.
  
  When the newly emerged land eroded, it produced sediment that washed
  into the oceans and buried the organic matter, preventing further
  reactions with oxygen, the scientists believe. As a result, oxygen was
  allowed to build up in the atmosphere and enable oxygen-breathing life
  to evolve and flourish.
  
  The eroded sediment would also have fertilised the oceans with
  phosphorous, an important nutrient for living things.[1]
  
  The Pali Canon calls this phosphorus “skin” rasa-pathavi (lit.
  ‘earth-sap’). Interestingly in view of the subsequent reference to
  luminance, phosphorus emits a faint glow when exposed to oxygen. It is
  also an essential element of the human genetic material, DNA and RNA.


http://palisuttas.com/2015/04/26/aganna-sutta-dn-dn-27/