Proterozoic slates from Himachal Pradesh have been used a lot in the Himalayas.
These deposits occur in Himachal Pradesh’s Chamba, Kangra, Mandi, Kullu, Shimla, Sirmaur, Kinnaur, and Solan districts, they have been quarried since ancient times.
Shimla Town Hall Building, the Gaiety Theatre, Sarahan Palace and Bhimakali Temple, temples of Champavati and Laxmi Narayan are all made of this rock.
Slates are metamorphic rocks, it is highly fissile in nature, i.e. they can be split easily into thin, flat sheets with smooth surfaces. The sheets themselves on their own without any coating are strong, impermeable to water, and resistant to weathering, when built properly structures made from this rock can last several decades
This makes it the ideal material of choice for use in roofing, paving, fencing, and flooring as they are flexible and less prone to damage in hilly areas where the hazards from Earthquakes are high.
Some of these Slates could be from the Ediacaran Period 63 Crore years Old! when first complex life forms were still evolving, however usually fossils may not be preserved in slates.
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