In district is extracted precious building materials : limestone, quartz sand, clay shale.
2.
The Trimmers Rock Formation contains sandstone, siltstone, silt shale, and silty clay shale.
3.
However, the two deposits are invariable separated by a minimum of of clay shale and silt.
4.
The Harrell Formation contains clay shale and silty clay shale and the Mahantango Formation contains claystone and limestone.
5.
The Harrell Formation contains clay shale and silty clay shale and the Mahantango Formation contains claystone and limestone.
6.
Their description is that the lower half is composed of interbedded fine-grained, dusky yellow sandstone and olive-gray clay shale in ledgy graded beds about 20 cm thick, which grades into massive grayish-black siltstone in the top half of the formation.
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