Figure 2: Simplified map (Miller cylindrical projection) showing the principal bathymetric features in the southern Indian Ocean/Southern Ocean between 0° E and 90° E (based on the GEBCO Digital Atlas, 2003). Regarding scaling (see inset box), 20° of longitude at 20° S equates to 2093 km, at 40° S, 1708 km, at 60° S, 1116 km, and at 75° S, 578 km. Note that the 0–200 m bathymetric interval around Antarctica is not portrayed due to the incomplete dataset in some of the areas adjacent to the continent. Abbreviations: C.K.P., Central Kerguelen Plateau, G.R., Gunnerus Ridge, K.M.S., Kainan Maru Seamount, L.H.B., Lutzow-Holm Bay, Mad., Madagascar, Moz., Mozambique, N.K.P, North Kerguelen Plateau, Plat., Plateau, S.K.P., South Kerguelen Plateau. The red dashed lines indicate where on the ocean floor Anomaly M0 (120.4/125.0) and the end of the Cretaceous Normal Superchron are recorded (83.5 Ma) (based on Schettino & Scotese, 2001, 2005). In addition, west of the Gunnerus Ridge, the M4 (c. 130 Ma) anomaly ‘pick’ of Nogi et al. (2004) is shown. Late Cretaceous bio-connections between Indo-Madagascar and Antarctica: refutation of the Gunnerus Ridge causeway hypothesis. Journal of Biogeography Source.