Anthrax Rock is a non-descript jumble of boulders when viewed from the east. Assuming your approaching from near Dinosaur Rock, look for the short, smooth buttress at the right (north) end.Two routes are on this buttress, Mouthful of Gank, 5.10a, and Fistfull of Bush, 5.4.
Get to Dinosaur Rock in the Outback. Walk 150 yards west-northwest to a distinctive formation called Roof Rock (huge roof low to the ground). Now walk to the north to get to Anthrax Rock.