What evidence was found dating back to the Paleolithic era that indicates dance was a well-established part of primitive existence?

Answer: Rock paintings

Explanation: Rock paintings showed strong evidence of dance was part of early paleolithic life, most of the paintings where done on rocks. Some of the paintings found in ancient or paleolithic life described people dancing. The earliest evidence of prehistoric or paleotitic paintings was found in India and Spain. Examples of rock paintings showing dance done in primitive, Paleolithic life can be seen in different rocks in and around Africa, including the rock paintings in Ancient Egypt, it can also be found in Ancient Greece etc.

They discovered as a wall painted in a tomb about harvest dance. Early cultures used dance as a means of communication and as a way of life.