The rover is looking for signs of ancient life within a 45-kilometer-wide crater known as Lake Jezero.
The dry crater was filled with water more than 3.5 billion years ago.
It is understood that the river delta flooded over the crater wall, dispersing minerals and clay that could possibly have trapped and fossilized ancient life.
The main mission of the rover is to explore the crater and collect samples of rock, soil and other minerals for analysis.
Perseverance captured "escarpments" on the steep slopes, which were formed from sediment, accumulated at the mouth of the delta river, and then spilled into the crater lake.
"We saw different layers in the escarpments that contained rocks up to 5 feet (1.5 meters) wide that we knew there was no point in being there," said Nicolas Mangold, a Perseverance scientist at the Laboratoire de Planรฉtologie et Gรฉodynamique in Nantes, France.
The layers mean that the slow, meandering waterway that fed the delta river must have been transformed by subsequent flash floods.
Mangold and the scientific team estimated that a torrent of water would have had to travel at speeds of 6 to 30 km / h to transport the rocks.
NASA gives first look at Perseverance helicopter
