Seamers James Harris and Michael Hogan claimed four wickets apiece as Glamorgan took a 33-run first-innings lead over Nottinghamshire on day two of their LV= County Championship clash at Sophia Gardens.
The visitors had moved into a strong position before losing their last six wickets for 30 runs as they were bowled out for 285 with Hogan taking 4/47 and Harris 4/65.
"We're really happy with the last session, we thought at lunch, 110-1, we were staring down the barrel of a few tough sessions," said Harris.
"Then from 255-4, we got that fifth wicket and we managed to knock them over, so to take a lead like that is really pleasing, then for the boys (Lloyd and Byrom) to play as well as they did has really set us up.
"It came out OK today, I tried to hit the wicket, we got a bit of movement which helped and to get some good players at the top of the order out is good.
"We couldn't be more pleased with how the day finished, there's a few demons in the pitch and it's only going to get worse probably, so we'll score as many as we can and see where we are."