Filtering by: Creator Demetrion, Robert A. Remove constraint Creator: Demetrion, Robert A.
ArticleDemetrion, Robert A.A new genus, a new subgenus, and five new species of pterioid bivalves are described from shallow-marine faunas in the middle lower to middle Eocene Bateque Formation in the vicinity of Laguna San Ignacio to about 105 km southward, Pacific coast of Ba . . .
ArticleA New Species Of The Clypeasteroid Echinoid Astrodapsis From The Miocene Isidro Formation, Baja California Sur, MexicoDemetrion, Robert A.The clypeasteroid echinoid Astrodapsis bajasurensis n. sp. is described from upper middle Miocene beds of the Isidro Formation near the mouth of Arroyo Mezquital on the Pacific coast of north-central Baja California Sur, Mexico. The new species is the . . .
ArticleA new species of the oligopygoid echinoid Haimea from the lower Eocene of Baja California Sur, MexicoSquires, Richard L.The oligopygoid echinoid Haimea bajasurensis n. sp. is described from middle lower Eocene ("Capay Stage") shallow-marine sandstones in the middle part of the Bateque Formation and shallow-marine limestones in the upper part of the Tepetate Formation, . . .
ArticleSandy, Michael R.Two species of terebratulide brachiopods are described from the upper part of the Bateque Formation (middle Eocene) on the Pacific coast of Baja California Sur, Mexico, Terebratulina cf. Terebratulina louisianae Stenzel, 194, and Terebratalia batequia . . .