Open-side Mark Rennie went close also, but the Ospreys' scramble defence held out.
But this brought Amla to the crease alongside Petersen, who came into the side after Mark Boucher fell victim to a back spasm.
It was no more than the home side deserved after Mark Allott, then Glynn Hurst had earlier gone close.
Matt Lacey, John Fogarty, Chris Keane, David Gannon and David Slemen scored tries for the home side, with Mark McHugh kicking four conversions.
Farrell converted and Sarries were well in control before Robinson got his side off the mark with only their second foray into the visitors' 22.
Under their new manager, Tony Mowbray, the Glasgow side will expect a stern test from an Aberdeen side led by Mark McGhee - the former Celtic striker who had himself hoped to take over at Parkhead before rejoining one of his other former clubs.
In his Upper West Side office, Mark Kurlansky, author of The Big Oyster, a chronicle of the rise and fall of the bivalve in New York, is couched by a hotch potch of model ships, statuettes of jumping fish, an atlas, piles of novels, foreign language dictionaries, encyclopedias and loose papers.
McCallan and John Mooney at least dragged their side past the 200 mark.
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He had Jefferson lbw with his third ball, and two deliveries later Sutton took a good low catch down the leg side to send back Mark Wagh for a duck.
On the other side of the cut mark by a long way was Scot Colin Montgomerie, who carded a four-over 74 to add to his disastrous first-round 82 for 16 over.
Police say they found the gun about 12ft away, on the other side of railings from where Mark Duggan fell.
BBC: News - Hutchinson-Foster case shines light on Duggan shooting mystery
The teacher tried to get it off with a wash cloth, and it left a red mark on the side of his face.
On the Democratic side, there's Mark Warner, another ex-governor who had earlier toyed with a White House bid (and who challenged John Warner in 1996).
It makes it two defeats from two for Mark Robins' side this season, after Barnsley's 4-0 defeat at QPR in their opening league game on Saturday.
The game was there for the taking and Schmidt's side stepped up to the mark, pinning Munster back as they began to make better use of possession.
Two snowy custom dress shirts lie side by side, one belonging to Mark Twain and the other to Oscar Wilde (saved from oblivion because it was at the laundry when he died).
WSJ: Beau Brummell and His Heirs | Men of Fashion | RISD Museum | By Laura Jacobs
Manchester City lead the group with seven points, but they wasted a series of chances to claim their third consecutive Group A victory as Mark Hughes' side had to settle for a 0-0 home draw against Paris Saint Germain on Wednesday.
Referee Mark Halsey then presented the home side with another chance to get the third when he adjudged that Robert Huth had felled McSheffrey, who duly sent Mark Schwarzer the wrong way from the spot.
However, Mark McGhee's side were level on 33 minutes when Stephen Hughes hit the bye-line and picked out Clarkson, who tapped home from close range.
"He has a badly dislocated shoulder, " said coach Mark Robinson, whose side finished 85-4, a lead of just 60 over Durham, in their second innings.
Essex skipper Mark Pettini declared his side's second innings after Ryan ten Doeschate (56) and Matthew Walker (53no) had both completed half-centuries during the morning session.
Chris Malone twice had a chance to level the scores either side of the half-hour mark, but each time the Quins fly-half pushed his kick across the posts.
It was harrowing viewing for New Zealand coach Mark Greatbatch as his side lost their last six first-innings wickets in just 12.1 overs at the start of play.
Since moving from Manchester City in 2009, Sturridge has struggled to make his mark in a Chelsea side that includes forwards Anelka, Didier Drogba, Florent Malouda and Solomon Kalou.
Sheffield coach Mark Aston, his side's star player winning the Lance Todd Trophy when he played at scrum-half in that shock Wembley victory 12 years ago, was only briefly in dreamland.
Taumaholo Taufahema powered over to give Mark Ring's side a 21-12 half-time lead, but after the break Vale notched an early try, Scott Mitchell breaking through poor defence to score underneath the posts.
Kenny Dalglish recalled Lubomir Moravcik to the side in the place of the injured Mark Viduka.
Mark Vermeulen, in the side for injured Grant Flower, was unconvincing in reaching 27 when he played onto his stumps.
"That's the mark of a very good side and Wales are capable of doing that at the moment, " Guscott told Scrum V.
Ian Holloway's side had to come from behind after Mark Hudson gave Cardiff a ninth minute lead, heading home Peter Whittingham's free kick.
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