Here's a better source [1]. They found some organic goop, like kerogen. Might actually be organic (as in microbial) in origin.

However methane and organic matter gets discovered every 2 weeks. Perhaps next week they'll rediscover water for the 10,000th time. I get the excitement for the few that weren't aware of it, but it's getting really tiring for the rest of us.

http://www.sciencemag.org/news/2018/06/nasa-rover-hits-organ...