[srweaver]

"The rate of mutation and genetic change is relatively constant."

And we know this because what?

Observation or supposition.

What is our time baseline?

[Thatcherite]

"The rate of mutation and genetic change is relatively constant." And we know this because what? Observation or supposition. What is our time baseline?

We can calibrate it historically with other observations such as rates of erosion, rates of rock formation, radiometric dating, tree-rings, varve counting. All of these techniques give remarkably consistent results. If our uniformitarian assumption is wrong, then why do lots of different techniques that rely on uniformitarianism give the same results?

[js1138]

Observation.