That depends on the exact size of the rocks, - however a good rule of thumb for river rock in general is about 1.4 -1.6 tons per cubic yard. -So 14 cubic yards would be approximately 20 tons.
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11.852 cubic yards
123.44 cubic yards
27 cubic feet = 1 cubic yard60' x 60' x 2' = 7,200 cubic feet = 2662/3 cubic yards
The answer depends on how deep the coverage will be. River Rock weighs 2,800 LBS. per cubic yard - That's 1.4 tons per cubic yard. One ton = 2,000 LBS. 2,000 divided by 2,800 equals roughly 0.71. So one ton of river rock is roughly 0.71 cubic yards. 0.71 cubic yards covers roughly 230 square feet 1" deep 0.71 cubic yards covers roughly 115 square feet 2" deep 0.71 cubic yards covers roughly 77 square feet 3" deep 0.71 cubic yards covers roughly 57 square feet 4" deep 0.71 cubic yards covers roughly 38 square feet 5" deep
137.5 cubic feet or 5.09 cubic yards.