Webster’s Revised Unabridged Dictionary · 1913
Shelfy
Shelf′y (·y̆), a. 1. Abounding in shelves; full of dangerous shallows. "A shelfy coast." Dryden.
2. Full of strata of rock. [Obs.]
The tillable fields are in some places . . . so shelfy that the corn hath much ado to fasten its root. Carew.