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In addition, local climatic and environmental conditions determine whether fossilization will occur, so that there is differential preservation among different locations.
Moreover, the rock sequences are not always complete in all places, so certain periods cannot be investigated.
These specific required conditions explain why fossils are so rare. : The Making of the Biological Past Response: Since fossilization requires very unique circumstances, fossils are very rare.
As a result, fossils do not necessarily provide a complete representation of the past.
Fossils are found in a variety of rock, but most often in sedimentary rock, which forms from the accumulation of sediments.