"Rock slab" refers to a large, flat piece of rock that is often thick and heavy. It can be natural or man-made and is commonly used in construction or for various types of outdoor activities, such as rock climbing or paving. Full definition
C) Surface of rock slab showing numerous Hummelstown fossils. (sciencedaily.com)
By the time I pause to summon courage at the top of the black diamond - rated Rock and Roll, a steep rock slab, my forearms burns from squeezing brake levers. (kickinghorseresort.com)
Curiosity Mastcam image of the Old Soaker rock slab taken on Sol 1555. (sciencedaily.com)