Glamorgan 153 for 5 (Carlson 46*) trail Durham 471 for 9 dec (Carse 91, Trevaskis 79, Robinson 73, Jones 69, Borthwick 59, Labuschagne 4-81) by 318 runs
On a rain shortened day Glamorgan finished on 153 for five, still 318 runs behind Durham's first innings total of 471 for nine declared.
Carse and Liam Trevaskis put on 128 runs, a record seventh-wicket record stand for Durham against Glamorgan, before the visitor's seamers took five wickets to put them in complete control.
Having lost all of day two to rain and another 38.4 overs today it will be very difficult for Durham to force a result but they are the only side who can hope for a win from this game.
Durham started the day with their sights set on maximum batting points and it was Carse who led the charge on his way to his best first class score. Trevaskis was happy to let his partner to do the heavy lifting when it came to run scoring as Carse took on the Glamorgan bowlers. When Carse fell, trapped lbw by Michael Neser, Durham had added 47 runs to their overnight score in just 9.5 overs .
The partnership between Carse and Trevaskis was the largest of the Durham innings, and took them to their highest innings total of the season so far.
The Durham seamers were an immediate threat with the new ball, with Raine, Carse and Paul Coughlin creating chances. Coughlin dismissed Eddie Byrom first ball and David Lloyd fell to Ben Raine for 31 on the stroke of lunch.
Resuming after the interval at 50 for two, Glamorgan were in need of runs from their strong middle order, that did not happen. Labuschagne and Billy Root fell lbw to Raine and Brydon Carse bounced out Sam Northeast to reduce the home side to 72 for four, still 399 runs behind.
It was an afternoon that was full of interruptions with the players going off for bad light for the third time before persistent rain arrived with the umpires calling off play for the day at 5:40pm.
There will be 96 overs available tomorrow for Durham to try and force an unlikely win, but with the weather forecast a mixed bag it seems unlikely that all of that cricket will be possible.