Question

Match the following sedimentary rocks in Group I with their compositions in Group II

Group I		Group II
P	Packstone	1	< I5% matrix, > 25% rock fragments
Q	Cirainstone	2	> 15<½! matrix, >259t feldspar
R	Lithic arenite	3	Grain supported, contains no mud
S	Arkosic wacke	4	Grain supported, contains mud

• A. P-4, Q-3, R-l, S-2
• B. P-3, Q-4, R-2, S- I
• C. P-3, Q-l, R-4, S-2
• D. P-2, Q-4, R-1, S-3

Answer 1

The Correct Option is A

Let's match the sedimentary rocks in Group I with their respective compositions in Group II based on the given options and correct answer:

1. Packstone (P): This rock is characterized as being grain-supported and containing mud, which corresponds to option 4 in Group II: "Grain supported, contains mud".
2. Cirainstone (Q): This rock has no mud and is grain supported, matching option 3: "Grain supported, contains no mud".
3. Lithic arenite (R): This rock is composed of less than 15% matrix and more than 25% rock fragments, aligning with option 1: "< 15% matrix, > 25% rock fragments".
4. Arkosic wacke (S): This rock contains more than 15% matrix and more than 25% feldspar, fitting option 2: "> 15% matrix, >25% feldspar".

Based on the above reasoning, the correct match is:

• P - 4
• Q - 3
• R - 1
• S - 2

Therefore, the correct answer is: P-4, Q-3, R-1, S-2.