Question

Which of the following structures form in marine environment?

• A. Lateral accretionary surfaces
• B. Hummocky cross stratification
• C. Herringbone cross stratification
• D. Barchanoids

Answer 1

The Correct Option is A, B, C

To determine which structures form in a marine environment, we need to understand the characteristics of the options given:

1. Lateral Accretionary Surfaces:

   These structures are typically found in fluvial and deltaic environments. However, they can also form in marine environments in certain settings, particularly where sediments accumulate laterally along tidal channels or estuarine settings.

2. Hummocky Cross Stratification (HCS):

   Hummocky cross stratification is a type of sedimentary structure commonly associated with storm-dominated marine environments. It forms in shallow marine settings, such as on continental shelves, where oscillatory currents created by storms rework the bottom sediments.

3. Herringbone Cross Stratification:

   This structure typically forms in tidal environments, which are part of marine settings. Herringbone cross stratification results from alternating tidal currents that change direction, creating cross-bedding that appears to criss-cross.

4. Barchanoids:

   Barchanoids or barchan dunes are generally associated with aeolian (wind-driven) processes and occur in desert environments. Therefore, they do not typically form in marine environments.

Based on the explanations above, the correct structures that form in marine environments are:

• Lateral Accretionary Surfaces
• Hummocky Cross Stratification
• Herringbone Cross Stratification

Therefore, the correct answer involves identifying these structures as appropriate for marine settings, as they are influenced by water currents and sedimentation patterns unique to marine and tidal settings.