What geological structure is Gilbert Hill?

Gilbert Hill is a vertical monolith column composed of black basalt rock formed by molten lava during the Mesozoic Era.

Where is the rock column located?

The formation stands in the Andheri area of Mumbai.

Which other sites share similar geological features?

The vertical columns resemble the rock structures at Devils Tower in Wyoming and Devils Postpile in California.

What environmental conditions impact the hill?

The basalt monolith experiences continuous structural erosion.

What legal protection applies to Gilbert Hill?

The site holds heritage structure status under the Municipal Corporation of Greater Mumbai and previously received national park designation under the Forest Act.

Bombay · Inde

Gilbert Hill: ce qu’il y a autour, comment y aller et quand venir · 2026

Tenants settling in Andheri share their immediate neighbourhood with a prehistoric volcanic monolith that rises straight out of the dense suburban sprawl.

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Gilbert Hill is a sheer column of black basalt rock rising above the urban fabric of Andheri.

The monolith formed when volcanic lava erupted through fissures in the earth during the Mesozoic Era and cooled into vertical basalt columns. Similar geological formations exist at Devils Tower in Wyoming and Devils Postpile in California. The surrounding ridge once extended into neighbouring Jogeshwari before industrial quarrying destroyed those adjacent formations, leaving this solitary pillar as the sole surviving remnant.

Municipal authorities designated the column as a protected heritage structure following sustained petitions by geologists, which banned quarrying operations on the site. The Central Government earlier classified the land as a National Park under the Forest Act. Despite legal safeguards against adjacent industrial activity, the sheer rock faces suffer from persistent natural erosion.

Associations

Basalt MonolithFormed by volcanic eruptions that covered large regions of western India.
Devils Tower ComparisonShares rare columnar basalt structures with famous North American landmarks.
Structural ErosionExposed vertical rock surfaces face ongoing weathering and structural decay.
Heritage ProtectionMunicipal heritage status prohibits commercial quarrying and excavation.

Faits

The monolith is an exposed column of black basalt with vertical faces in the Andheri area.
The Central Government designated the site as a National Park under the Forest Act.
Municipal authorities declared the hill a protected heritage structure to prohibit local quarrying.
The geological formation shares structural similarities with Devils Tower in Wyoming.

Mis à jour le 21 septembre 2026Source : Wikipedia

Gilbert Hill: ce qu’il y a autour, comment y aller et quand venir · 2026

Gilbert Hill is a sheer column of black basalt rock rising above the urban fabric of Andheri.

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