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A Pug-Nosed Crocodyliform from the Late Cretaceous of Madagascar

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A Pug-Nosed Crocodyliform from the Late Cretaceous of Madagascar letters to nature red zone in Fig. 1) in accord with geochemical observations23,24. The Supplementary information is available on Nature’s World-Wide Web site conduit is at least 250–300 8C hotter than the surrounding mantle (http://www.nature.com) or as paper copy from the London editorial office of Nature. and less than about 400 km in diameter in the transition zone, in line with the absence of the plume signature in a recent global Acknowledgements tomographic model25. Due to the large diameter of the Fresnel zone We thank IRIS/GEOSCOPE for making the KIP data available to us, P. Dawson and B. Chouet for retrieving the seismic data from the broadband stations on the island of (300 km at 660 km depth) of the converted waves with 10 s period, Hawaii, H. Ka¨mpf for discussions, and G. Helffrich for comments on the manuscript. This the actual size of the anomalous zone at 660 km depth may be much work was supported by the Deutsche Forschungsgemeinschaft within the International smaller than 400 km. The relatively small size of the plume at Continental Drilling Project (ICDP) and the GeoForschungsZentrum Potsdam. 660 km depth suggests that the plume originates below this bound- Correspondence and requests for materials should be addressed to R.K. 7 ary, similar to the finding for the Iceland plume and consistent with (e-mail: [email protected]). another seismological study indicating lower-mantle origin for another (Bowie) hotspot26. Our estimations suggest, however, that the Hawaii plume temperature is at least 100 8Chigherthanthetem- perature of the Iceland plume, which is in accord with petrological observations19 and recent dynamic models of both plumes27,28. It is possible that the localized, very-low-velocity zone at astheno- ................................................................. spheric depths that we observe is usable as an indicator of a plume A pug-nosed crocodyliform from the conduit. The depth of the top of this zone contains information on the temperature within the plume conduit. M Late Cretaceous of Madagascar Received 3 September 1999; accepted 4 May 2000. Gregory A. Buckley*, Christopher A. Brochu†, David W. Krause‡ 1. Wilson, J. T. A possible origin of the Hawaiian Islands. Can. J. Phys. 41, 863–870 (1963). & Diego Pol§ 2. Morgan, W. J. Convection plumes in the lower mantle. Nature 230, 42–43 (1971). 3. Morgan, J. P., Morgan, W. J. & Price, E. Hotspot melting generates both hotspot volcanism and * Evelyn T. Stone University College, Roosevelt University, Chicago, Illinois 60605, hotspot swell? J. Geophys. Res. 100, 8045–8062 (1995). 4. Hofmann, A. W. Mantle geochemistry: the message from oceanic volcanism. Nature 385, 219–229 USA (1997). † Department of Geology, Field Museum of Natural History, Chicago, 5. Watson, S. & McKenzie, D. Melt generation by plumes: A study of Hawaiian volcanism. J. Petrol. 32, Illinois 60605, USA 501–537 (1991). ‡ Department of Anatomical Sciences, State University of New York, Stony Brook, 6. Ribe, N. M. & Christensen, U. Three-dimensional modelling of plume-lithosphere interaction. J. New York 11794, USA Geophys. Res. 99, 669–682 (1994). 7. Shen, Y., Solomon, S. C., Bjarnason, I. Th. & Wolfe, C. J. Seismic evidence for a lower-mantle origin of § Division of Paleontology, American Museum of Natural History, New York, the Iceland plume. Nature 395, 62–65 (1998). New York 10024, USA 8. Russel, S. A., Lay, T. & Garnero, E. J. Seismic evidence for small-scale dynamics in the lowermost .......................................... ......................... ......................... ......................... ......................... mantle at the root of the Hawaiian hotspot. Nature 396, 255–258 (1998). 9. Ji, Y. & Nataf, H.-C. Detection of mantle plumes in the lower mantle by diffraction tomography: Although the image of crocodyliforms as ‘unchanged living Hawaii. Earth Planet. Sci. Lett. 159, 99–115 (1998). fossils’ is naive, several morphological features of the group are 10. Bock, G. Long-period S to P converted waves and the onset of partial melting beneath Oahu. Geophys. thought to have varied only within narrow limits during the Res. Lett. 18, 869–872 (1991). 1 11. Woods, M. T., Leveque, J. -J., Okal, E. A. & Cara, M. Two-station measurements of Rayleigh wave course of evolution . These include an elongate snout with an group velocity along the Hawaiian Swell. Geophys. Res. Lett. 18, 105–108 (1991). array of conical teeth, a dorsoventrally flattened skull and a 12. Priestley, K. & Tilmann, F. Shear-wave structure of the lithosphere above the Hawaiian hot spot from posteriorly positioned jaw articulation, which provides a power- two-station Rayleigh wave phase velocity measurements. Geophys. Res. Lett. 26, 1493–1496 (1999). ful bite force. Here we report an exquisitely preserved specimen of 13. Nishimura, C. & Forsyth, D. Rayleigh wave phase velocities in the Pacific with implications for azimuthal anisotropy and lateral heterogeneities. Geophys. J. Int. 94, 479–501 (1988). a new taxon from the Late Cretaceous of Madagascar that deviates 14. Yuan, X., Ni, J., Kind, R., Mechie, J. & Sandvol, E. Lithospheric and upper mantle structure of southern profoundly from this Bauplan, possessing an extremely blunt Tibet from a seismological passive source experiment. J. Geophys. Res. 102, 27491–27500 (1997). snout, a tall, rounded skull, an anteriorly shifted jaw joint and 15. Kosarev, G. et al. Seismic evidence for a detached Indian lithospheric mantle beneath Tibet. Science clove-shaped, multicusped teeth reminiscent of those of some 283, 1306–1309 (1999). 16. Bina, C. R. & Helffrich, G. Phase transition Clapeyron slopes and transition zone seismic discontinuity ornithischian dinosaurs. This last feature implies that the diet of topography. J. Geophys. Res. 99, 15853–15860 (1994). the new taxon may have been predominantly if not exclusively 17. Sobolev, S. V. et al. Upper mantle temperatures from teleseismic tomography of French Massif Central herbivorous. A close relationship with notosuchid crocodyli- including effects of composition, mineral reactions, anharmonicity, anelasticity and partial melt. 2 Earth Planet. Sci. Lett. 139, 147–163 (1996). forms, particularly Uruguaysuchus (Late Cretaceous, Uruguay) 18. Karato, S. & Jung, H. Water, partial melting and the origin of the seismic low velocity and high is suggested by several shared derived features; this supports a attenuation zone in the upper mantle. Earth Planet. Sci. Lett. 157, 193–207 (1998). biogeographical hypothesis that Madagascar and South America 19. Sobolev, A. V. & Nikogosian, I. K. Petrology of long-lived mantle plume magmatism: Hawaii, Pacific were linked during the Late Cretaceous3 . and Reunion Island, Indian Ocean. Petrology 2, 111–144 (1994). 20. Hirth, G. & Kohlstedt, D. L. Water in the oceanic upper mantle: implications for rheology, melt Archosauria Cope 1869 extraction and the evolution of the lithosphere. Earth Planet. Sci. Lett. 144, 93–108 (1996). Crocodyliformes Hay 1930 21. Gaherty, J. B., Jordan, T. H. & Gee, L. S. Seismic structure of the upper mantle in a central Pacific ?Notosuchidae Dollo 1924 corridor. J. Geophys. Res. 101, 22291–22309 (1996). Simosuchus clarki gen. et sp. nov. 22. McKenzie, D. & Bickle, M. J. The volume and composition of melt generated by extension of the lithosphere. J. Petrol. 29, 625–679 (1988). Etymology. Generic name from Greek simos, pug-nosed, and Greek 23. Hauri, E. H., Lassiter, J. C. & DePaolo, D. J. Osmium isotope systematics of drilled lavas from Mauna souchos, the Egyptian crocodile-headed god. Specific name for Loa, Hawaii. J. Geophys. Res. 101, 11793–11806 (1996). 3 James M. Clark in recognition of his contributions to crocodyliform 24. Hilton, D. R., McMurtry, G. M. & Goff, F. Large variations in vent fluid CO2/ He ratios signal rapid changes in magma chemistry at Loihi seamount, Hawaii. Nature 396, 359–362 (1998). systematics. 25. Ekstrom, G. & Dziewonski, A. M. The unique anisotropy of the Pacific upper mantle. Nature 394, Holotype. University of Antananarivo UA 8679, complete skull and 168–172 (1998). anterior portion of postcranial skeleton including cervical and 26. Nataf, H. -C. & VanDecar, J. Seismological detection of a mantle plume? Nature 364, 115–120 (1993). anterior dorsal vertebrae, cervical and anterior dorsal osteoderms, 27. Ribe, N. M. & Christensen, U. R. The dynamical origin of Hawaiian volcanism. Earth Planet. Sci. Lett. 171, 517–531 (1999). and complete pectoral girdle and forelimbs (Fig. 1); discovered by 28. Ito, G., Shen, Y., Hirth, G & Wolfe, C. J. Mantle flow, melting, and dehydration of the Iceland mantle L. L. Randriamiaramanana. plume. Earth Planet. Sci. Lett. 165, 81–96 (1999). Type locality and horizon. Field locality MAD98-17, southeast of 29. Vinnik, L., Chevrot, S. & Montagner, J. P. Evidence for a stagnant plume in the transition zone? the village of Berivotra, Mahajanga Basin, northwestern Madagas- Geophys. Res. Lett. 33, 149–163 (1997). 30. Kennett, B. L. N. Seismological Tables (Research School of Earth Sciences, Australian National car; Maevarano Formation, Upper Cretaceous (Maastrichtian, 3 University, Canberra, 1991). perhaps late Maastrichtian ). NATURE | VOL 405 | 22 JUNE 2000 | www.nature.com © 2000 Macmillan Magazines Ltd 941 letters to nature Diagnosis. Differs from all other crocodyliforms in possessing the with an extensive posterior floor formed by the parietal and following: entire dentition consisting of clove-shaped, multicusped squamosal. Each is capped by two small, circular ossifications teeth with cusps arranged
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