The Curiosity spacecraft found strange shapes on Mars that look like sharp spikes
The SETI Research Institute has created a note that these spikes are most likely cemented fillings of ancient cracks in sedimentary rock. The rest of the Martian rock was of softer rock and therefore collapsed from erosion.
We present to you another interesting find provided by the Perseverance rover on Mars, Sol 467, Mastcam-Z camera.
Kevin Gill worked with the data.