Some layers are more resistant to the abrasive action of sand and water than others. The horizontal layers, or bedding planes, vary slightly in composition and hardness.
Pancake Rocks Oparara River Geological Type and Limestone Formation
The same geological principles apply to the Pancake Basins at the Pororari River, where similar limestone formations have been sculpted by river and sea. This process of compaction, combined with the precipitation of calcite cement from mineral-rich groundwater, bonded the particles together.
Compaction and Cementation Over millennia, the sheer weight of subsequent sediment layers compressed the loose skeletal fragments. Differential Erosion Not all layers erode at the same rate.
Pancake Rocks Oparara River Geological Type and Limestone Formation
While limestone is the dominant rock type in this specific location, it is crucial to understand that not all limestone looks the same. The slow, incremental buildup of these organic remains created a thick, dense layer of biological limestone that would eventually form the geological canvas for the Pancake Rocks.
More About What type of rock are the pancake rocks made of
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