I presume you're aware the Mexico bones are a tiny part of what's been found around the world dating to roughly the same time period, the end of the Pleistocene. Alaska and the islands north of Siberia for example hold enormous bone yards.
Yes, I am aware of the Alaska finds, the miners call it “muck”, large areas of crushed and intermixed bones.
Be advised I do not think this caused a global flood, like the Genesis account. I’m not going to mix science and religion.
But also realize that an object impacting the ice shield would have instantaneously vaporized hundreds of millions of tons of ice, probably more than enough to make it rain worldwide for forty days, if not one heck of a lot longer!