Question

The type of fold in which younger rock formation is present outside and older rock formation is present inside the fold is known as

• A. Syncline
• B. Anticline
• C. Chevron fold
• D. Recumbent fold

Hint:

A simple way to remember:
Anticline = A-shaped arch, with Ancient rocks in the middle.
Syncline = Sinks down like a trough, with younger rocks in the middle.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks to identify the type of geological fold based on the relative age of the rock layers within it.

Step 2: Detailed Explanation:
Geological folds are wavelike structures formed when rock layers are bent or buckled.
The two most basic types of folds are anticlines and synclines:
-

Anticline: This is an arch-like fold where the rock layers are bent upwards.
Due to this arch shape, the oldest rock layers are found in the core (the center) of the fold.
As you move outwards from the center, the rock layers become progressively younger.
The description "older rock formation is present inside the fold" and "younger rock formation is present outside" perfectly matches the definition of an anticline.
-

Syncline: This is a trough-like fold where the rock layers are bent downwards.
In a syncline, the youngest rock layers are in the core, and the layers get older as you move outwards.
-

Chevron fold and

Recumbent fold describe the shape and orientation of the fold, not the age relationship of the strata.
A chevron fold has sharp, angular hinges, and a recumbent fold is an anticline or syncline that has been overturned onto its side.

Step 3: Final Answer:
A fold with older rocks in the core and younger rocks on the outside is an anticline.
This corresponds to option (B).