Gilbert Hill is a 200 foot (90 m) monolith column of black basalt ck in Andheri, Maharashtra,India. The rock has a sheer vertical face and was created when molten lava was squeezed out of the earth's clefts during the Mesozic Era about 65 million years ago. During that era, molten lava had spread around most of the Indian states of Maharashtra, Gujrat and Madhya Pradesh, covering an area of 50,000 km². The volcanic eruptions were also responsible for the destruction of plant and animal life during that era.
According to experts, this rare geological phenomenon was the remnants of a ridge and had clusters of vertical columns in nearby Jogeshwari which were quarried off two decades ago.