Types of fossils, Biology

TYPES OF FOSSILS -

S.No.

Fossil

Example

Mode of formation

1

Unaltered

(Preservation)

Wooly mammoths, 25,000 years

old, ice in Siberia, mummies, insect.

Whole bodies are found frozen in ice.

2

Altered or

petrified fossils

Bones, shell, teeth, wood etc.

Replacement of organic parts by mineral

deposits is called petrification.

3

Coprolite

Coenozoic mammals

Faecal pellets buried in sediments.

4

Moulds and

Casts

Gastropods (Mullusca)

from Portland

Moulds of hardened and fossilized mud that surround an extinct individual, the burried individuals have been completely destroyed but the moulds retained true

copies of their shape.

5

Impressions

Archaeopteryx feather, leaf

Remains in fine grained sediments on

which organisms died.

6

Imprints

Dinosaur footprints, prints of leaf,

skin, wing etc.

Footprint trails, tract of

organism.

7

Compression

Plants

Main tissues part disappears and only the outer tough parts remains intact covering into rock.

Posted Date: 10/8/2012 8:59:04 AM | Location : United States







Related Discussions:- Types of fossils, Assignment Help, Ask Question on Types of fossils, Get Answer, Expert's Help, Types of fossils Discussions

Write discussion on Types of fossils
Your posts are moderated
Related Questions
Which of the following serves as an actuating signal, or as part of an actuating signal, in a negative feedback system? A. Action potentials in diaphragm skeletal muscle fibers

Complete feed blocks For manufacturing the pellets, processes such as grinding, mixing, steaming and pressing and some times extruding, are applied using special and expensive

Typical Form or Reparative Regeneration - Heteromorphosis Sometimes the part which grows back is not the same as that which was lost. The phenomenon is called Heteromorphosis.

why we call leech as sangivorous

In the previous sub-section we discussed the possible ways by which variabiliti can, be generated. We shall now examine one instance that illustrates the consequence of variability

Q. What are neoplasias? The Neoplasia is any abnormal and uncontrolled proliferation of cells of an organism. The Neoplasias can be benign or malign and benign neoplasias are t

Types of overpopulation - People overpopulation People overpopulation refers to a situation where there are more people than the supplies of food, water and other vital resour

Q. What is the gas exchange unit of the mammalian lungs? The gas exchange units of the mammalian lungs are the alveoli. Q. What is the physical process through which gas ex

Aim: To prove that oxygen is evolved during photosynthesis. Apparatus: Beaker, funnel, test tube, water, Hydrilla plants. Procedure: Take a few pieces of Hydrilla plant. Keep a

Define Agar Syringe/Agar Sausage Method? Agar syringe method involves 100 ml syringe, which is filled with agar. A layer of agar is pushed beyond the end of the barrel by means