Durham look poised to top Division One of the LV= County Championship after dominating day two of their match against Sussex at Chester-le-Street.
Replying to Durham's first-innings 245, Sussex were skittled for just 112 as Graham Onions (4-50), Usman Arshad (3-16) and Mitchell Claydon (3-25) ran amok.
Durham then increased their lead to 345 by thee close with Phil Mustard's unbeaten 57 helping Durham recover after an early wobble to finish the day on 212-6.
Sussex's batting looked very fragile after they resumed on 60-3 and Onions took the day's first two wickets, starting when left-hander Luke Wells drove well wide of off stump and edged to Mustard.
Rory Hamilton-Brown drove the first ball he faced for a straight four then drove at an away swinger and Mustard dived in front of first slip to hold the edge.
Nightwatchman James Anyon resisted well to make 19 before fending a return catch to Mitch Claydon and wicketkeeper Ben Brown remained unbeaten on 21.
Harry Finch, the 18-year-old debutant, scored 11 before Arshad had him lbw and he also had Will Beer and Steve Magoffin caught behind for ducks.
Claydon bowled last man Lewis Hatchett to finish with 3-25.
Durham led by 133 and, after his 96 in the first innings, Mark Stoneman again started fluently before a ball from Anyon which kept low had him lbw for 21.
The rest of the top five fell to edged catches, before captain Paul Collingwood and Mustard set out to see off the dangerous Magoffin. They succeeded but continued to grind out the runs as Chris Nash was in his tenth over of off spin and had conceded only 13 when Collingwood tried to work him to leg off the back foot and was lbw for 45.
Mustard spent 137 balls making his unbeaten 57 and put on 93 in 36 overs for the sixth wicket with Collingwood to put Durham in control heading into day three.