because they most likely came from different areas. so they didn't have the same type of climate. another possibility is that amber traps only small animals or insects it seems
molds and casts, trace fossils, petrified wood, and carbon filmThe four types of fossils are mold fossils, cast fossils, true-form fossils, and trace fossils. Mold fossils are impressions from when the plant or animal first decomposed. Cast fossils are plant or animal remains. True-form fossils are remaining body parts from an animal. Trace fossils are marks that have been left by animal, such as footprints.
Fossils can be preserved in either ice or snow, also can be preserved in mud, coal, sand, silt.
Insect fossils are hard to find because of the environment in which they lived -- and died. If an insect just drops dead it needs to be in an environment which is suitable for the formation of fossils. If it dropped into a lake or river it could be eaten by a fish -- no chance of fossilisation there. If it was in a desert it would dry up and its' exoskeleton would break apart and blow away. Insect fossils are normally found in amber, (fossil tree sap), which is very sticky when fresh, some cherts have insect fossils, (sometimes found where there were hot, silica-rich volcanic springs).
Amber is 2-3 on the mohs scale of hardness.
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Amber is fossilized tree resin, while most fossils are made from the remains of organisms.
Any organism or parts of an organism counts as a fossil when preserved within amber, so fossils can be stored in amber.
in a rock
the amber will envolve into a aratactol and the others r not realy that good but thetre rare hope that helps you
Amber.
amber, petrified fossils, trace fossils, carbon films, molds, and cast.
Resins from plants and trees that gets trapped & preserved in the soil and eventually gets hardened over a long period of time.
Imprint fossils, Mineralized fossils, frozen fossils, fossils in amber, and cast fossils.
Fossilized tree sap is called amber.-Leah Ward
Amber.
Fossils can form by: Freezing Amber Asphalt Carbonization
I think your looking for Fossils, They contain imprints of Plant and Animal material up to millions of years old. If you want a specific rock that contains Preserved animal or plant remains, try Amber, its Tree sap that has solidified into rock over time and often the insects or plants are perfectly preserved inside. I hope this was helpfull!