The main mass of the 1.85-Ga Sudbury Igneous Complex (SIC) has been recently interpreted as a 2.5-km-thick impact melt-sheet that differentiated into norite, gabbro, and granophyre layers. This interpretation requires the SIC to have been emplaced as a horizontal sheet ponded in a complex impact crater whereby orogenic folding is regarded as the cause of its synformal geometry. However, three independent lines of structural evidence from the SIC and its Huronian host rocks indicate that the SIC was not a horizontal sheet at the time of its consolidation.1. Planar mineral fabrics of the unstrained norite and gabbro layers are subparallel to the synformal base of the SIC and mineral lineation plunges toward the center of the SIC. This radial lineation pattern is inconsistent with an initial horizontal sheet geometry of the SIC, but is consistent with preconsolidation strain caused by gravitational reorientation of crystals on inclined magma chamber walls.2. Anisotropy of magnetic susceptibility (AMS) of the granophyre reveals a magnetic lineation that is orthogonal to the basal contact of the SIC. This fabric is correlated to acicular plagioclase crystals and is thus interpreted as a wall-orthogonal crystallization texture. Fold-induced strain is expected to overprint such textures most severely where the curvature of the SIC is greatest, e.g., in the North Lobe. However, the angular departure of this lineation from its initial contact-orthogonal orientation is minimal in this area. Shortening strains estimated from AMS numerical modeling and microstructural analysis are significantly lower than strains expected from orthogonal flexural folding, <15 vs. 50%, respectively. The observed low strain levels are in agreement with a primary parabolic geometry of the SIC, but are inconsistent with folding of a consolidated horizontal melt-sheet.3. Structural analysis of Huronian host rocks shows that deformation of these rocks can be explained without invoking rotation of Huronian strata as a consequence of impact cratering. Moreover, the absence of pervasive, post-SIC ductile strain in Huronian rocks and the adjacent norite, the uniform northwest-southeast-directed, late-orogenic compression, and the regional tectonometamorphic correlation suggest that shortening of the SIC was not accomplished by noncylindrical buckle folding but rather by imbrication of the southern SIC on thrust surfaces of the South Range Shear Zone.Cowan, E. J., Riller, U., and Schwerdtner, W. M., 1999, Emplacement geometry of the Sudbury Igneous Complex: Structural examination of a proposed impact melt-sheet, in Dressler, B. O., and Sharpton