Outfielder Kole Calhoun was optioned back to Triple-A Salt Lake to create room on the active roster and Vernon Wells (thumb surgery) was transferred to the 60-day disabled list to open a spot on the 40-man.
"We have some guys [in the bullpen] that have thrown a lot, and the Colorado series took a lot of innings out of our bullpen," Angels manager Mike Scioscia said. "We just need some coverage down there, and also, Kole needs to play. So, it served a couple of purposes."
Calhoun, a 24-year-old left-handed hitter who can play all three outfield spots, went 3-for-12 and appeared in eight games during his first big league callup.
Pauley, signed to a Minor League contract in Spring Training, was charged with five earned runs in 9 1/3 innings through four relief appearances with the Angels this season, before being designated for assignment, clearing waivers and being outrighted back to the Minors in late May.
The 28-year-old Pauley has posted a 1.76 ERA in 30 2/3 innings in the Pacific Coast League.