Re: indisputable evidence for the geological theories of gradualism, deep time and plate tectonics. <== so which is it indisputable or theory? The law of biogenesis is almost indisputable as are the thermodynamic laws - almost or as close as it gets which is why we call them laws and not theories.
When science becomes theories, assumptions and conjecture is when it attempts to explain history and define it’s duration. Go back to the fundamentals of the scientific method and see if you can determine exactly why science can’t accurately define any aspect of unobserved history.
“A scientific theory is a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation.[1][2] As with most (if not all) forms of scientific knowledge, scientific theories are inductive in nature and aim for predictive power and explanatory force.[3][4]”