Documentation
Click on one of the aggregates below to take a closer look.
Aggregate Map
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Soft
Soft Limestone, Sandstone, Dolomite Limestone, Siliceous, Soft Shell
Medium Soft
Pit Gravel, Limestone, Dolomite
Medium
Medium Hard River Rock, Medium Traprock, Decomposed Granite, Medium Crushed Gravel
Medium Hard
Granite, Slate, Traprock, Basalt, Quartzite
Hard
Hard Chert, Quartz, Flint Rock, Hard River Rock