Unit A — Tan sandstone with land fossils, including plants of Permian age. Unit
ID: 108475 • Letter: U
Question
Unit A — Tan sandstone with land fossils, including plants of Permian age.
Unit B — Greenish shale with marine fossils, including Ordovician trilobites. The top of the unit was weathered and eroded prior to deposition of unit A, but the layers in the two units are parallel to each other and to their mutual contact.
Unit C — Coarse sandstone and beach conglomerate that contains Cambrian trilobites. The base contains clasts derived from the underlying granite (G).
Unit K — Gray limestone with marine fossils of Cretaceous age.
Unit R — Partly consolidated river gravels with a thick, well-developed soil. Contains land mammals of middle Cenozoic age.
Unit S — Reddish and pinkish sandstone that was deposited by rivers and in lakes. It contains Jurassic dinosaur bones.
Explanation / Answer
By following the geological age scale, the sequence from oldest to youngest is as given below:
Rock units: C - B - A - S - K - R
Phanerozoic are upto C-B-A only.
Mesozoic belongs to S and K whereas Unit R is of Tertiary era.
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