The life has a relatively hard part forming part of the body composition is relatively hard and resistant. The resistant parts;
• In tumubuhan can be:
1. celulose missal owned by fungi, algae, mycomycites.
2. Silica is owned by: Diatomea, Carex, Equisites (plant ponytail)
3. Calcium carbonate is owned by: Coralina officinalis (red alge), Halimeda (green algae)
• In Animals can be
1. Calcite, eg: Coral, bryozoans, brachiopods, Globigerina, echinoderma.
2. Aragonite: Miliolina, Quinqueloculina, Triloculina (three belong to the order-walled foraminifera porcelain) coral types Madreporaria, Scapopoda (including grade levels of molluscs)
3. Silica missal owned by Radiolaria, Silicispongiae
4. Chitine eg Hydrozoa, Ceratispongiae, Graptozoa and arthropods.
5. Calcium carbonate missal By: Ascidians (including phylum Protozoa), animal bones vetebrata.
Soon Closed, fine grained sedimentary rocks, so it is not possible there is oxygen that is able to invite the presence of bacteria to decay, more perfect if at the time of the life of the dead is at reducing environment.
Soon spared, from the process of destruction as a result of the work force of endogenous or exogenous force or eaten by aerobic or anaerobic bacteria.
The description above suggests to us, that the fossil will not be found in sedimentary rocks that have a coarse grain such as breccia, conglomerate etc. like. The rocks that have the nature of the shaft. So apabilah originally in the rock there is a life to die soon be damaged by bacteria and will not form a fossil
The third condition is absolutely necessary so that the rest of life can form fossils, which is the target hunting paleontologist.
