As seen in questions and answers here, here and here, Puranas attribute the differences in their contents to different Kalpas. However if that is indeed the case, why don't we ever read about events taking place in Kalyugs of previous Mahayugas,Manvantaras or Kalpas. Is it because of lack of events in Kalyugs that can help us in spiritual development ? Also there is no mention of events taking place in 8th and later Manvantaras from previous Kalpas. Any reasons ? Can it be that verses in the couple of Puranas that match different Puranas with Kalpas are spurious ?