Its eminent characteristic is its thousands of hoodoos in addition to hoodoo rocks, referred to locally every bit “goblins”, which are formations of mushroom-shaped stone pinnacles, some every bit high every bit several meters. The distinct shape of these rocks comes from an erosion-resistant layer of stone atop softer sandstone.
The green lies inside the San Rafael Desert southeast of the E limb of the San Rafael Swell in addition to due north of the Henry Mountains. Utah State Route 24 passes nearly 4 miles E of the park. Hanksville lies 12 miles to the south.
Hiking is permitted inwards the park, which features iii marked trails.
The odd stone shapes inwards Goblin Valley effect from the weathering of Entrada Sandstone. The Entrada consists of debris eroded from one-time highlands in addition to redeposited on a one-time tidal apartment of alternating layers of sandstone, siltstone in addition to shale. The rocks demo bear witness of beingness nigh the margins of an ancient body of body of water amongst the ebb in addition to catamenia of tides, tidal channels that directed currents dorsum to the body of body of water in addition to coastal sand dunes.
Joint or fracture patterns inside the Entrada sandstone beds created initial zones of weakness. The unweathered joints intersected to cast abrupt edges in addition to corners amongst greater surface-area-to-volume ratios than the faces. As a result, the edges weathered to a greater extent than quickly, producing the spherical-shaped ‘goblins’.
The Entrada Sandstone from which the hoodoos developed was deposited inwards the Jurassic Period around 170 1000000 years ago.