The Digester

Chemical analysis of aluminum-rich clay pebbles in Jezero crater suggests prolonged rainfall and habitable conditions during the Noachian epoch.

Kaolinite pebbles in Jezero show strong iron and magnesium depletion and aluminum and titanium enrichment consistent with intensive chemical weathering by liquid water.
The clay chemistry argues against short-lived hydrothermal alteration from impacts or volcanism and points to modest temperatures and persistent rainfall.
Authors compare the clays to similar Earth deposits from past greenhouse climates and say conditions may have lasted thousands to millions of years.
The result supports a warm, largely ice-free Noachian climate over the competing cold and icy scenario.
Samples collected by Perseverance are cached for return, but the planned Mars sample return mission has been canceled according to the article, delaying Earth-based analysis

Perseverance finds signs that early Mars was warm and wet