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Updated: May 9, 2025
Middle trap; sheets of basalt and ash 4,000 " 3. Lower trap; basalt with inter-trappean beds 500 " 6,000 " ========
Volcanic ash, or bole, is frequently found separating the different lava-flows; and in the upper amygdaloidal sheets numerous secondary minerals are found, such as quartz, agate and jasper, stilbite and chlorite. The total thickness of the whole series, where complete, is about 6,000 feet, divided as follows: 1. Upper trap; with ash and inter-trappean beds 1,500 feet 2.
The original excessive fluidity of the Deccan trap is proved by the remarkable horizontality of the beds over large areas, and the extensive regions covered by very thin sheets of basalt or dolerite. As regards the geological age of this great volcanic series much uncertainty exists, owing to the absence of marine forms in the inter-trappean beds.
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