High School

There are two types of preservation seen in this sample. This rock type is called a "biomicrite," which is a fossiliferous limestone. The shells were originally composed of the mineral aragonite but have since altered to calcite.

Which two types of preservation are seen in this sample?

Answer :

The two types of preservation seen in this sample are replacement and recrystallization.

Replacement preservation occurs when the original mineral composition of the shells is replaced by another mineral. In this case, the shells were originally composed of aragonite but have been replaced by calcite. This process can happen through various mechanisms, such as mineral-rich groundwater infiltrating the pores of the shells and depositing new minerals.

Together, these preservation processes have contributed to the formation of the biomicrite, a fossiliferous limestone composed of shells that were originally formed from aragonite.

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