Figure F7. Typical ophiolite stratigraphy (after Casey and Karson, 1981) juxtaposed against predictions of geophysical studies of slow-spreading ridges, which predict that the plutonic section is formed by the solidification of short-lived, small, ephemeral magma chambers. Such a model predicts a complex stratigraphy of stratiform intrusions or sill-like plutons (Boudier et al., 1996) with crosscutting igneous plutons that feed sheeted dikes and pillow lavas at the surface. In addition, the lithologic succession should show extreme heterogeneity as each magma body differentiates independently. TR = Trondhjemite intrusions.