Fortunately, it looks like Perseverance rover will start digging in the right place
Evidence of ancient microbial life in Martian soil will not be easy to find, and some of it may have been destroyed by the flow of liquid acid, according to research published in Scientific Reports.…
https://go.theregister.com/feed/www.theregister.com/2020/09/16/samples_of_prehistoric_signs_of/