4. Modes of preservation 4.1 Organism: Mode of preservation: 4.2 Organism: coral

Question

4. Modes of preservation 4.1 Organism: Mode of preservation: 4.2 Organism: coral Mode of preservation: FIZZ TEST Hints: This specimen is hard. You can get a sense of this by the sharp edges shown where it is broken. You could not scratch this with a knife blade Does this fizz when HCT (a dilute solution of kydrochloric acid) is added nswer: No 4. Modes of preservation (cont.) 4.3 Organism: Mode of preservation: 4.4 4.4 Organism: Mode of preservation: FIZZ TEST Does this fizz when HCI (a dilute solution of iydrochloric acid) is added? RSWer Yes

Explanation / Answer

4.1 organism - plant fossile because it is showng leaf like structure.

mode of preservation- impression mark .. only leaf impression is there.

4.2 organism - coral

mode of preservation since corals are made up of calcite so its mode of preservation is recrystallisation.

4.3 organism - bivalve since ir loogs like 2 valve . and the valce which is facing upward may not have across the valve symmetry hence it is bivalve.

mode of preservation - by seeing the structure it looks like mould.

4.4 organism - brachiopod sunce it has sulcus in its valve

mode of preservation- brachiopod are preserved by the replcament of original structure by the sediments.

4.5 organism - echinoderm since it has 5 leaf like structure in its top and it is rounded

mode of preservation the mode of preservation for this also be replacement

4.6 organism - brachiopod since sulcus present on the valve

mode of preservation = replacement of priginam structure

4.7 organism a crinoid

mode of preservation- mode of preseravation is imprint of original structure on the sediments

4.8 organism snails

mode of presevation - track and trails since they bury themself inside the sediments there tracks are preserved in the sediment

4.9 organism cephalopod

mode of preservation - here the original part is not present only the replaced part is present so recrystallisation and replacement may give the preservation of this fossile

4.10 organism - ammonits

mode of preservation these are also preserved by the replacement process.

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