50. Imagine the following geological situation, as determined for group of rock

Question

50. Imagine the following geological situation, as determined for group of rock strata in a tectonic mountain belt. (You might like to draw yourself a sketch of this to help you answer the question that follows.) A sequence ?? hoiaonal beds of siale(cia) and limestone overlie a series of folded lava flows which display a number of anticlines and synclines. The lava beds are between 520 Ma and 500 Ma, and the oldest of the overlying sedimentary layers is 200 Ma with the youngest being 85 Ma. The boundary between the lava and the sedimentary beds is called a (an) a) intrusion b) disconformity c) paraconformity ) orogen angular unconformity

Explanation / Answer

Ans) Disconformity

the age of lava beds are between 520 to 500 Ma but the overlying sedimentary deposits are only 200Ma old, this shows a period of large erosion or non deposition.

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