There are three sedimentary layers stacked in their original order: sandstone on the bottom, shale in the middle, and limestone on top. This sequence represents a marine transgression, where sea level rose over time and different sediment types were deposited.

1. There are three horizontal sedimentary layers stacked on top of each other. They appear in their
original order of superposition. The bed on the bottom is sandstone. The bed directly above the
sandstone, in the middle of the stack, is shale. The bed above the shale, on the top of the stack, is
limestone. What does this sequence of rocks (facies) represent?
Group of answer choices
a. A marine transgression
b. A marine regression
c. Long-term, stabilized (non-changing) sea level
d. A tsunami deposit