The robber is looking for signs of ancient life in a 45-kilometer-wide crater known as Lake Jezero.
The dry crater was once filled with water more than 3.5 billion years ago.
It is understood that the river delta flooded over the crater wall, spreading minerals and clay that may have captured and strengthened ancient life.
The primary mission of the rover is to explore the crater and collect samples of rock, dirt and other minerals for analysis.
Perseverance caught “sharp” in the steep slopes, formed by sediment, collected at the mouth of the delta river, and then spilled into the crater lake.
“We saw distinct layers in the sharps that contained rocks up to 1.5 feet above that we knew were irrelevant,” said Nicolas Mangold, a perseverance scientist at the Laboratoire de Planétologie et Géodynamique in Nantes, France.
The layers mean the slow, winding waterway that feeds the delta river must be transformed by later, fast-moving flash floods.
Mr Mangold and the science team estimated that a body of water with speeds of 6km / h to 30km / h had to travel to transport the cobblestones.
NASA gives first glimpse of Perseverance’s helicopter