Discussion
The correct chronological order (older to younger) of the following stratigraphic units is :
P : Talchir Tillite
Q : Muth Quartzite
R : Umia Ammonite Bed
S : Umaria Marine Bed
Answer: B
The order from older to younger is Q-P-S-R.
- Muth Quartzite: Silurian to Devonian, in the Tethyan Himalaya of Spiti.
- Talchir Tillite: latest Carboniferous to earliest Permian, the glacial base of the Gondwana sequence.
- Umaria Marine Bed: Early Permian, a marine band within the lower Gondwana sediments of Madhya Pradesh, just above the Talchir.
- Umia Ammonite Bed: Late Jurassic to Early Cretaceous, in the Umia Member of Kutch.
Every other option puts the Jurassic Umia beds or the Permian units below the Palaeozoic Muth Quartzite, or the Umaria bed below the Talchir.
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