...Figure 8. Seafloor surface renderings for the Torbrook block. (a) Derived from multibeam data, (b) derived from the zero-phase first-arrival pick of the 3D seismic cube, and (c) a difference map of the two sources of elevation data. Seismic line orientations were east-west and multibeam survey...

... paleomagnetic study localities ( Spariosu et al. 1984 ) for the White Rock and Torbrook formations at Torbrook (WR, TB) and the Cheverie Formation (CV). Inset map shows the Meguma terrane in regional relationship with other peri-Gondwanan terranes Avalonia, Ganderia and with Laurentian elements...

... and segmented basement horst block composed of rocks of the lower Paleozoic Meguma Supergroup ( Deptuck et al., 2015 ). This arch is a southwest-northeast–oriented structure that is 12 to 38 km (7 to 24 mi) wide and extends 150 km (90 mi) offshore, separating the Georges Bank Basin from the Shelburne subbasin...

...–sericite defined cleavage CM6 291854 4939151 Torbrook No Yes Spotted hornfels; matrix recrystallized quartz and f.g. decussate epidote, chlorite, and biotite WR10 * 385711 4990548 White Rock Yes No f.g. quartz-rich clastic rock KV4 * 350558 4979305 Kentville Yes No Well-cleaved...

... peraluminous granitoid rocks (e.g., Clarke et al. 1997 , 2004 ). However, along its northwestern margin in the Wolfville, Torbrook, Bear River, Cape St. Marys, and Yarmouth areas ( Fig. 1 ), the Meguma terrane also includes Silurian and Early Devonian volcanic and sedimentary rocks, known collectively...

... formation, which consists mainly of distinctly banded maroon and green, thin- to medium-bedded metasiltstone to slate. The equivalent unit in the Torbrook–Wolfville area is the Tupper Lake Brook formation, which is lithologically similar but also contains 5- to 20-mm-wide, ptygmatically folded, Mn-rich...

... marine facies on the Avalonian marginal platform. No clasts were found that are likely to have been derived from the Torbrook Formation, and thus from the Meguma terrane in southwestern Nova Scotia, as has been previously reported. The association of relatively large, reworked fossiliferous clasts...

... = the angle between bedding plane pole and the axial plane in the profile plane. Fig. 5. Parameters related to curvature in a fold hinge: (a) profile plane, (b) lower hemisphere plot, (c) block diagram, and (d) curvature plotted against radius of the tangent circle in the fold hinge. See text...

... area ( Fig. 1 , region with the densest data coverage). Cumulatively, they cover ∼8500 km 2 and are referred to here from west to east as the Barrington, Torbrook, Thrumcap, and Weymouth 3D seismic surveys (CNSOPB program numbers NS24-P3-4E, NS24-P3-2E, NS24-P3-1E/2E, and NS24-P3-4E, respectively...

... Ar/ 39 Ar ages from ca. 410 to 385 Ma ( Keppie and Dallmeyer, 1987 ; Muecke et al., 1988 ; Kontak et al., 1998 , Hicks et al., 1999 ) and by the fact that the youngest deformed rocks are the Lower to Middle Devonian (Lochkovian to Lower Emsian; Bouyx et al., 1997 ) Torbrook Formation (age range...

... ), which forms the boundary between the Avalon and Meguma terranes. The Guysborough block was interpreted by Webster ( 1996 ) and Webster et al. ( 1998 ) to have been uplifted at a restraining bend in the Cobequid–Chedabucto fault system. Fig. 2. Simplified geological map of the Lochaber–Mulgrave...

... Carboniferous accretion of Meguma and possibly Suwannee which led to the Fammenian orogeny. The episodicity of orogeny suggests that the present location of these domains parallels their order of accretion. However, each of these crustal blocks was translated along strike by large-scale Late Devonian...

... masses generally were southwestward. The largest volcanic- and plutonic-rock boulders are found in the northern of the three sequences in Silurian conglomerates with red matrix. Paleogeographic reconstruction of the Silurian shows that tilted fault blocks bounded northeast-trending troughs; Ordovician...

... lie unconformably on Meguma Terrane basement. This consists of early Paleozoic metasedimentary rocks of the Meguma Group ( Woodman 1904 ; Stevenson 1959 ) or, more recently, Meguma Supergroup ( White 2008 ), and the overlying Whiterock, Kentville, New Canaan, and Torbrook formations. These basement...

... Torbrook Formation (D TR ), Silurian South Range Diorite (S SDR ), Devonian South Mountain Batholith (D SMB ), and Clayton Hill pluton (CHP). Note the occurrences of the Bloomfield formation of the Goldenville Group (GGbl) that cores a syncline in the southwest part of the map area, the Acacia Havelock...

... ), and overlying Silurian–Devonian White Rock and Torbrook formations ( Murphy et al. 2004 b ) . If Avalonia was a source of sediment for the Meguma terrane in the Early Cambrian, that situation must have changed by the Middle Cambrian. Numerous studies have suggested that Avalonia originated close...

... ), the Halifax Group is unconformably overlain by the Rockville Notch Group, which contains Silurian to Early Devonian slate, quartzite, and metavolcanic rocks ( White and Barr 2017 ; White et al. 2018 ). The Torbrook Formation and possibly parts of the New Canaan Formation at the top of the Rockville Notch...

... of the Silurian to Devonian White Rock, Kentville, New Canaan, and Torbrook formations, all of which were deposited in shallow water continental settings ( Schenk 1995b ). The entire succession was regionally deformed and metamorphosed during the Acadian Orogeny at 400–375 Ma ( Keppie and Dallmeyer 1987 ; Kontak...