The 201 Ma North Mountain Basalt (NMB) of southern Nova Scotia, part of the Central Atlantic Magmatic Province, forms a prominent cuesta along parts of the Bay of Fundy. The NMB is generally conformable with a basin fill sequence of underlying (Triassic) and overlying (Jurassic) red-brown, terrestrial sedimentary rocks. Deposition of the 400 m thick, subaerial sequence of continental tholeiites was rapid (<0.5 Ma), probably fissure fed and is subdivided into lower- (LFU), middle- (MFU) and upper-flow (UFU) units based on field relationships. The LFU (<180 m) is a single, massive, medium-grained, dominantly holocrystalline ponded flow. Based on limited field and drill hole data, it is suggested that LFU deposition was partly into a faulted-bounded trough. In its upper part the LFU locally contains layers of mafic pegmatite (<1 m) with or without thin (cm) rhyolite bands. The MFU (<165 m) contains multiple (<15), thin (1-15 m), geometrically-complex flows with abundant (<30-50%), zeolite-bearing amygdules distributed in a consistent and repetitive manner. Bottom pipe vesicles indicate a consistent NE-movement direction and the MFU has features typical of pahoehoe flows. The UFU (0-150 m) is massive, represents 1 or 2 flows, and generally contains <30-40% mesostasis in a medium-grained, ophitic-textured host. Both the LFU and UFU have well-developed columnar jointing, whereas the UFU may also contain segregation pipes (3-60 cm wide; felsic composition) towards the base. The NMB is dominated by augite (Wo_40-30En_60-20Fe_10-50), calcic plagioclase (An_30-70) and equant- to skeletal Fe-Ti oxides with trace pigeonite (Wo₅En₇₅Fe₂₀). Although uncommon in the LFU, some MFU and most UFU contain a mesostasis with skeletal Fe-rich augite (to Wo₂₀En₁₀Fe₇₀), plagioclase (An_30-60) and skeletal Fe-Ti oxide with additional components related to silicate-liquid immiscibility: (1) an interstitial, variably altered and devitrified glass of intermediate to felsic composition, and (2) spheres of Fe-Ti-P - rich silicate melt may have unmixed to a Fe-Ti-P phase and hedenbergite-like pyroxene (35 wt. % FeO). In several samples of MFU and UFU is abundant (30%) red-brown felsic (i.e., 74 wt. % SiO₂) glass with microlites (<50 µm) of skeletal apatite. Mobilization of this felsic melt probably led to formation of segregation pipes.