Which of the following best characterizes an angular unconformity?
A)Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity.
B)Horizontal lava flows lie below the unconformity and horizontal; sedimentary strata lie above.
C)The discordant boundary between older strata and an intrusive body of granite.
D)Tilted strata that lie below the unconformity are truncated at the unconformity,and strata above the unconformity are also tilted and truncated,but at a different angle

Question

Quizplus · Accepted Answer

Angular unconformities occur when tilted or folded strata are eroded and new layers are deposited on top, but they are parallel to the unconformity, indicating a period of erosion and non-deposition before the new layers were added. Choice A describes this relationship.

Which of the Following Best Characterizes an Angular Unconformity