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 In this case, the shells were originally composed of aragonite but have been replaced by calcite.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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