Explanation:

- Gold: While gold can be found in various geological formations, it is not typically associated with sedimentary rocks on the western and eastern flanks of the Gujarat peninsula.

- Bauxite: This is an ore of aluminum and is formed by the weathering of rocks. It is not predominantly found in this region of Gujarat.

- Manganese: Manganese deposits can occur in sedimentary rocks but are more common in regions with different geological characteristics, not typically in the Gujarat peninsula.

- Petroleum: This is a key resource found in sedimentary basins globally, including Gujarat's regions. It's often trapped within the sedimentary rock formations.