Pg. 193 (fig. 2), 194, 204. Truthville Slate Formation (header); Truthville Formation (in text). Soft, well-cleaved, fissile, silty, mica spangled, olive gray-green, tan weathering slate with rare, usually thin (1 to 2 cm) arenites near base. Thickness 20 to 60 m; typically 45 m. Underlies Browns Pond Formation, contact is sharp and marked by distinct color change from gray-green to black. Gradationally overlies Bomoseen Formation, marked by absence of characteristic Bomoseen wacke. No fossils. Age is considered Cambrian(?).
Type locality: along Mettawee River near Truthville, Washington Co., eastern NY. Name credited to L.D. Jacobi [L.L. Delano], 1977, SUNY-Albany MS thesis.

Source: Publication.