In the three-plus years since Paul and Shannon Brock bought and took over Silver Thread Vineyard, they’ve quickly pushed the label’s reputation forward. Paul makes wines in a clean, focused style that is well suited to the region and to the vineyards the couple buys fruit from. Silver Thread Vineyard 2013 Dry Riesling ($18) is made using fruit from a variety of sources — 32% was estate grown fruit on Seneca Lakes, while 33% came from Gridley Bluff Point Vineyard (Keuka Lake), 30% from Doyle East Seneca Vineyard (Seneca Lake) and 5% Randolph O’Neill Vineyard (Cayuga Lake). Crisp and clean, the nose is…