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Our Director of Winemaking Mike Sinor likes to call it “moon dust,” but it actually comes from the ocean, not outer space…
Of course, we are talking about the uplifted ancient sea bed at our estate Margarita Vineyard, along a block that we call Oyster Ridge.
Here, massive white oyster fossils—some as large as footballs—are literally spilling out of the ground, embedded in fine pale calcareous soil that looks like, well, moon dust.
Considering that Margarita Vineyard is tucked into the Santa Lucia Mountains at the top of the towering Cuesta Grade above San Luis Obispo, the sight of old sea creatures here is rather astonishing. So, how did they get here?
Well, the vineyard is tucked between two local seismic faults, and it is located only about 45 miles from the massive San Andreas fault. Over thousands of years, tectonic grinding and localized earthquakes have turned the old inland sea into today’s dry ground.
Still, you rarely see an ancient sea bed exposed along the surface like you do at Margarita Vineyard. We just happen to be located in a very geologically active spot, which explains why the vineyard spans a rare array of five soil types.
But the bottom-line question is: What does all of this mean to the wine?
For starters, Calcium-rich soil is coveted by winemakers worldwide. And considering that Wine & Spirits Magazine called Oyster Ridge “perhaps the most dramatically calcareous chunk of earth in the entire state,” that is saying a lot.
“Oyster Ridge is planted predominantly to Bordeaux varietals,” Mike says. “The fruit from this soil displays pretty aromatics, with high-toned flavors and really fine tannins. The Cabernet from this spot is different from the Cabernet on other parts of the ranch.”
He adds, “At the end of the day, it gives us another color to paint with, and to create an estate Cabernet blend with balance and complexity.”