What is this plant?

What is this plant?

Observation - What is this plant?. Description: Pink, geranium like flowers in tight clusters at top of stem. Leaves are hairy, pinnate and form a rosette at the base of the single stalk but also continue up the stalk. Plant is growing on limestone rubble on an abandoned quarry floor.

Pink, geranium like flowers in tight clusters at top of stem. Leaves are hairy, pinnate and form a rosette at the base of the single stalk but also continue up the stalk. Plant is growing on limestone rubble on an abandoned quarry floor.