Marlonia was an inhabited planet with an archeologically interesting history. This planet was inhabited by the Marlonians. According to Guinan, this planet was one of the most beautiful planets in the entire quadrant.
While on the planet, Captain Picard worked at an archeological dig, near some ancient Marlonian sites. He was permitted to take some pottery he found on the tertiary level of the dig, typical of second century Marlonian cookware, back to the Enterprise. Keiko spent her time studying the local fauna, and took home some samples of Draebidium calimus (which is quite similar to another plant indigenous to Marlonia, Draebidium froctus). (TNG: "Rascals")