Chris Silverwood recorded figures of 5-20 to put Yorkshire in a dominant position after the second day of their CricInfo Championship match against Glamorgan at Swansea.

Silverwood's impressive effort - his third five-wicket haul of the summer - was largely responsible for bowling Glamorgan out for 104, replying to Yorkshire's first innings of 280 all out.

But strangely Yorkshire skipper David Byas failed to enforce the follow-on, preferring instead to build on his side's 176-run first innings lead.

But the plan seemed to have backfired a little when Yorkshire found themselves 7-2 and then 53-4. By tea they had recovered to 87-4, a lead of 263.

By the close that lead had been increased to 378 thanks mainly to a 120-run partnership for the fifth wicket in 30 overs between Byas, who registered his second half-century of the match, and Gary Fellows.

The damage to the Glamorgan first innings was done when they found themselves 4-3 inside three overs this morning thanks to Silverwood. James got a fine edge to the wicket-keeper while Powell and Maynard edged to third and second slip respectively as Silverwood found plenty of life in the Swansea pitch.

Jimmy Maher did his best to launch a recovery along with Adrian Dale as the pair added 56 in 18 overs.

But then Dale and Maher perished in consecutive Gavin Hamilton overs as Glamorgan slumped to 61-5. There was more trouble just before lunch when Adrian Shaw was caught at short leg off James Middlebrook. And after lunch Glamorgan collapsed from 86-6 to 104 all out in the space of 4.1 overs.

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