so the geology/biology is my evidence for the biblical story.
The great fauna/flora change suddenly in time being the clue.
other creationists pick other times but are wrong.
Other creationists choose other times for the same reasons you choose K-T. If they, in your mind, are wrong then so are you.
You offer no special evidence for the K-T that other creations do not offer for their favorite slice of time.
And for all your twisting and weaving we already know when and where the K-T developed. It was an asteroid some 65 million years ago hitting Yucatan, and it had nothing to do with some mythical flud. No matter how you may wish to personally "interpret" the evidence that supports this, the facts of K-T/asteroid/Yucatan/65 million years will not go away.