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

Question

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 enswer the question that follows.) A sequence of horizonial beds of siale(clay) 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) 50. 6 a) intrusion b) disconformity c) paraconformity ) orogen e) angular unconformity

Explanation / Answer

Answer: e. Angular unconformity.

Explanation: The oldest rocks were folded. The youngest horizontal shale layer makes some angle with the folded igeneous rocks have anticline and synclinal structure. The angular unconformity is defined as the horizontal rock layers lies over the tilted and folded rock strata. Hence, angular unconformity is the correct answer.

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