Native american stone art work

I have only two pictures front and back the front picture you will see criss cross lines and the back of the stone you see a person on knees i think it is a female she is in front of a cave and you can clearly see the work this person carved i like this piece it has alot of work that he put into this stone from just tooling with stone sharp objects at one time during the 19th century there was a cave here it was blown to keep the cows out the sad part is there was no archeology done everything was a loss due to all the history that happened here from the revolution civil war and i think the cave goes farther in time i hope you like this find as i do it was found in laurel creek in Bethania nc