In salt dome development, which stage directly follows the Pillow Stage?

In salt dome development, which stage directly follows the Pillow Stage?

• A. Pillow stage
• B. Bottom growth stage
• C. True piercement stage
• D. Postdiapiric stage

Answer: (C)

In salt dome development, growth moves through a sequence of stages as the salt migrates upward through surrounding sediments. The Pillow Stage is an early intrusion where salt forms pillow-like tongues within the overburden. The next major transformation is the true piercement stage, when the diapir gains enough buoyancy and force to break through the surrounding sediments and establish a continuous path toward the surface. This piercing marks a shift from gradual intrusion to active penetration of the overburden, setting up the structure for later surface expression and postdiapiric features. The bottom growth stage describes ongoing accumulation at the base and can occur as the diapir continues to climb, but the direct transition after the pillow phase is the true piercement stage, with postdiapiric features appearing after piercement.

In salt dome development, growth moves through a sequence of stages as the salt migrates upward through surrounding sediments. The Pillow Stage is an early intrusion where salt forms pillow-like tongues within the overburden. The next major transformation is the true piercement stage, when the diapir gains enough buoyancy and force to break through the surrounding sediments and establish a continuous path toward the surface. This piercing marks a shift from gradual intrusion to active penetration of the overburden, setting up the structure for later surface expression and postdiapiric features. The bottom growth stage describes ongoing accumulation at the base and can occur as the diapir continues to climb, but the direct transition after the pillow phase is the true piercement stage, with postdiapiric features appearing after piercement.