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Answer :
The rocks that you would expect to be deposited globally as the ice retreated during the Snowball Earth hypothesis would be primarily sedimentary rocks.
1. Sandstone: Sandstone is a type of sedimentary rock that is formed from the accumulation and cementation of sand grains. It is commonly found in areas where there were once sandy environments, such as beaches or deserts. As the ice retreated and melted, it would have transported and deposited large amounts of sand, leading to the formation of sandstone deposits.
2. Coal: Coal is another type of sedimentary rock that forms from the accumulation and compaction of plant remains over millions of years. During the Snowball Earth period, plant life would have been limited or nonexistent due to the extreme cold. However, as the ice retreated, new plant growth could have started to develop. As these plants died and were buried, they would have eventually formed coal deposits.
3. Large lithic fragments supported in a fine-grained matrix: As the ice sheet advanced and retreated, it would have picked up and transported large rocks and boulders. These large lithic fragments would be embedded and supported by a fine-grained matrix, which could consist of sediment such as clay or silt. This type of deposit, known as a diamictite, is commonly associated with glaciation events and would indicate the extent of the ice retreat.
4. Fossiliferous limestone: Fossiliferous limestone is a type of sedimentary rock that contains a significant amount of fossils. During the retreat of the ice, new marine life could have started to flourish in the oceans. As these organisms died and settled to the seafloor, their remains would have been preserved in the sediment and eventually formed fossiliferous limestone deposits.
These different types of rocks would provide evidence of the changes in the environment during the Snowball Earth period, indicating the presence of glaciers, the formation of new plant life, and the flourishing of marine organisms as the ice retreated.
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