Calculate the tonnage of gravel needed by converting the cubic foot volume into tons. Use the standard formula of 15 cubic feet of gravel = 1 ton of gravel. Divide the total cubic foot volume of gravel by 15 to determine the number of tons of gravel to purchase. For example, 20 cubic ...
The base of this new layer is marked by an erosional surface above which is a basal deposit 12 cm thick consisting of shell gravel and sand. The shell layer included intact shells up to 2–3 cm long and coarse shell fragments. There is a sharp transition at 10 cm in the core, above...