[july4thfreedomfoundation]

“The vineyard was strewn with clam and oyster shells.”
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They could have been deposited there by a long-ago tsunami caused by a massive undersea earthquake or volcanic event in pre-historic times.

[AnAmericanMother]

“The vineyard was strewn with clam and oyster shells.”

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They could have been deposited there by a long-ago tsunami caused by a massive undersea earthquake or volcanic event in pre-historic times.

Or . . . applying Occam's Razor . . . some earlier viniculturist spread a few truckloads of clamshells to lighten the soil.

Calcium in Viticulture