Found this on Google:
Turtles were frequently etched onto grave monuments or carved into the bases of the commemorative tomb steles of Eastern potentates where they symbolised longevity, fertility and strength. In Indian mythology, the earth is supported on the backs of four elephants as they stand on a turtle.Mar 13, 2022
I’ve also heard turtles represent wisdom and healing. It seems that most North American tribes venerated the turtle for one or more reason. By the way, what a cool find!