Kevin Shine made hay, destroying Lancashire's first efort by taking 7 for 43 in 11.1 overs. The rot set in with his second ball and he ended the innings just before 12.50pm when Peter Martin was taken at square leg.
Shine did something very similar at Old Trafford five years ago, when he took 8 for 47 there for Hampshire.
Somerset did not exactly fins things a breeze when they tried their luck on the brown strip. Glen Chapple and Peter Martin took full advantage of the swing that was available and picked up four wickets each. Peter Bowler was the only batsman to reach fifty on the day, managing 53.
Wickets fell at Headingley, too, but there a spiteful pitch claimed 16 victims rather than the 21 who could not cope with Taunton's strip. Gloucestershire were bowled out for 205 and then reduced Yorkshire to 127 for 6 by the end of a tense first day.
Extra bounce from not much short of a length unsettled all the batsmen, who were also ill-equipped to deal with the numerous deliveries scuttling through at ankle height.
The most serious victim was the Yorkshire opener, Michael Vaughan, who took a blow from Mike Smith on his left wrist when 15 and retired with a cracked bone that could keep him out of action for up to three weeks.Reuse content