[crusty old prospector]

I am not sure about the temperatures but during the Cretaceous, there were no ice caps and an inland ocean extended from Texas up to Canada. Lots of chalk deposits and such. Rivers flowed east into it from the ancestral Rockies. Many of these sands from the rivers and their deltas produce oil and gas now.

[metmom]

It's the temps and claimed sea level rise I'm thinking of.

We are absolutely in a cooler than average for the planet phase now.

CO2 vs Temperature:

Global Temperature Trends From 2500BC to 2040AD: