I should have taken a picture, but I'll do my best to describe it.
2 weeks ago, I started a Munton's Pale Ale extract kit. Everything went perfectly normally, and I put it in my white plastic pail primary fermenter and set the lid on (not sealed) with a phone book on top to hold it down, but allow CO2 to escape.
Yesterday, I transferred it to secondary. The weird thing is, when I took the lid off, expecting to see clear beer with maybe a little krausen remnants around the edge, instead the entire surface of the beer was covered with what looked like yeast! What WAS that?
There was no bubbling, and it's been 2 weeks, so I was fairly certain fermentation was complete. I took an S.G. reading anyway, and it came out at 1.010. It didn't look "scummy," it really just looked like a uniform layer of yeast, about 1/4" thick. Is it possible it was yeast? Would yeast ever just settle on top like that? I used Safale US-05 yeast, and fermentation was at around 70 F.
I tasted the sample I took for S.G. measurement, and it tasted fine - I'm just curious what I was looking at, since I've never seen that happen before.