<国立科博専報>北海道の白堊系産爬虫類化石

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Many kinds of reptile bones were discovered from the Upper Cretaceous of Hokkaido. Although marine reptilian fossils have been known in the Cretaceous rocks of all parts of the world, only a few fragments of ichthyosaur were reported from Hokkaido. The present paper reports a mosasaur, an ichthyosaur, a pterosaur, eleven plesiosaurs, three chelonians containing two eggs from Hokkaido. The mode of occurrence of the bones and eggs, important characteristics of them, and associated marine invertebrates are briefly described. The geological age of the fossils ranges from the Cenomanian to Maestrichtian. The discovery of the above-mentioned various reptiles from Hokkaido is an interesting fact. They might be expected in other areas of Japan. The specimens will be greatly valuable in gaining our knowledge of the distribution and historical change of the Cretaceous reptilian fauna in the circum-Pacific region. Figure 1 shows the localities of the obtained specimens; the locality numbers correspond to the numbers put to the specimens described in the text and in the representative specimens listed below. The stratigraphic position of each specimen is given in brackets. 1. NSM-PV15004,Pl. 5,fig. 7 : Elasmosaurus (?) sp., tooth. [Lower Campanian] 2. NSM-PV15003,Pl. 5,fig. 5 : Plotosaurus (?) sp., caudal vertebrae. [Santonian or Coniacian] 3. NSM-PV15005,Pl. 5,fig. 4 : Pteranodon sp., limb bone. [Santonian-Lower Campanian] 4. A. NSM-PV15015 : Elasmosaurus (?) sp., vertebrae, costae. platy bone. [Lower Santonian] B. NSM-PV15014,Pl. 5,fig. 8 : Elasmosaurus (?) sp., vertebrae, phalanges, etc. [Lower Santonian] 5. NSM-PV15006,Pl. 5,fig. 6 : Polyptychodon sp. cf. P. interruptus OWEN. [Upper Cenomanian] 6. NSM-PV15007,Pl. 5,fig. 10 : Elasmosaurus (?) sp., vertebrae, humerus, ulna, costae. [Upper Turonian] 7. NSM-PV5564 : Myopterygius (?) sp., vertebrae, costae. [Upper Turonian] 8. NSM-PV15016,Pl. 5,fig. 9 : Elasmosaurus (?) sp., vertebrae, femur, pelvic bone, costae, platy bone, etc. [Turonian] 9. NSM-PV15019,Pl. 5,fig. 3 : Chelonia gen. et sp. indet., egg (?). [Turonian] 10. NSM-PV15017,Pl. 5,fig. 1 : Pleurosternon (?) sp., carapace. [Santonian] 11. NSM-PV15018,Pl. 5,fig. 2 : Trionychidae (?) gen. et sp. indet., egg. [Coniacian]
国立科学博物館の論文
1972-11-30

<国立科博専報>北海道の白堊系産爬虫類化石

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