Types of fossils

 Types of Fossils plants

1. Petrifactions or Mineralized plants: In this type of plants fossil the original cell of

the plant tissue is retained by means of some minerals like, silica etc. These mineral has

infiltrated the tissues. In this type of fossil sometimes the material of original plant may

be preserved e.g. coal balls, Silicified wood etc.

2. Cast on incrustations: In this type of plant fossil, the form of plant if preserved as

a cast. The cast result from the liking of a cavity formed by decay of tissues of plant

part. Here the internal, structures are destroyed and carbonaceous substances of the

plant are totally gone e.g. stem leaf scers, larger seeds etc.

3. Compressions: In this type of plant fossil, the external form of plant modifies and

leaves impressions on the sediment which over lie on it.

4. Compaction or Mummified plants: In this type of plant fossil, the plants or their

parts get compressed by vertical pressure against one another. Mostly plant rudiments

found in pea and coal as compactions. Coal or coal balls are the important sources of

plant fossils. Coals are irregular or sub spherical mass of calcium or magnesium

carbonates (or some other mineral matter).

5. Impressions: In this type of plants fossil, the roots, stems, leaves, fruits and seeds

are preserved as impressions in such a fashion that they seem to be the actual dried

specimens laid on the stone.

6. Amber: Coniferous plants exudates resinous substance. It drops on the floor of

forests. It accumulates and hardened over ages. Insects, fragments of plants and other

animals get preserved in it and become fossilized. It is called amber.