noun Date: 1860 a top stratum or overlying strata of resistant rock of a plateau that outcrops to form a vertical face, the edge or face of a ~ outcrop
RIMROCK
Meaning of RIMROCK in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012