They are commonly known as red clay soils being acidic, these soil sare founding tropics, and subtropics. Lacking in calcium, magnesium, and potassium. they are produced due to weathering and are found 8% worldwide.
They may be purplish red, brownish pale yellowish-orange. Having a pH of more than 5. The red and yellow color results from the iron oxides. They consist of 45% mineral and 5% organic matter.
To avoid the decay of matter adding manure to the fall is advisable with a significance of 2 to 3 thick layer as they are easily exhausted. Contain more calcium carbonate.
You are correct in your assumption. The kind of fossil that has been described in the question is Crystallization. It is also called crystallized fossil. The correct option among all the options that are given in the question is the second option. I hope that this answer has come to your help.