Pg. 119, 123, pl. 1 (geol. map); J.B. Hadley and others, 1938, Geol. map and structure sections of New Hampshire portion of Mt. Cube quadrangle, New Hampshire Hwy. Dept., scale 1:62,500; C.A. Chapman and others, 1938, Geol. map and structure sections of Mascoma quadrangle, New Hampshire, scale 1:62,500.
Sunday Mountain volcanic member of Orfordville formation. Consists of schistose greenstones in low-grade metamorphic zone of formation, and chiefly fine- to medium-grained amphibolite with some fine-grained biotite gneiss and black graphitic quartzite in middle-grade zone. Occurs near top of Orfordville formation above Hardy Hill quartzite member (new). Age is Middle Ordovician(?).
Named from outcrops on and near Sunday Mountain, Orford Twp., Mt. Cube 15-min quadrangle, Grafton Co., northwestern NH.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3773).

Pg. 15-16. Sunday Mountain volcanic member of Orfordville formation. Metamorphic equivalent of rhyolite and dacite tuffs and possibly some flows. Geographically extended into Vermont. Age is Ordovician.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3773).

Pl. 2 (geol. map). Sunday Mountain volcanics. Mapped together with Post Pond volcanics as a unit overlying Orfordville formation. Map legend shows Upper(?) Ordovician age.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3773).

Pg. 114-116. Sunday Mountain volcanic member of Orfordville formation. Stratigraphic revision of the Orfordville implies that the Post Pond and Sunday Mountain volcanic members are essentially equivalent; latter is not separately mapped.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3773).