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A level with fern stumps was discovered in the Aptian Douiret Formation, South-Tunisia. These stumps are preserved as external moulds or casts, without any preservation of anatomical structures. These stumps are considered to be affiliated with the numerous fossil plants assigned to the fern genera Alstaettia and Piazopteris that are widely distributed in coeval strata from the same region, either...
Octodontoidea is the most diverse group of caviomorph rodents. The systematics of most of the fossil representatives has been essentially based upon dental characters. Described here is an almost complete skull with dentition assigned to Prospaniomys Ameghino based upon its dental morphology. The specimen comes from the Sarmiento Formation at Pampa de Gan Gan (central Patagonia, Argentina), assigned...
Se describe una nueva especie de estructura microesporangiada Weltrichia Braun (Williamsoniaceae, Bennettitales) del Jurásico Medio de la región noroccidental del estado de Oaxaca. Los ejemplares se recolectaron en la Formación Tecomazúchil del Jurásico Medio, que aflora en la región de Ayuquila en el límite de los estados de Oaxaca y Puebla. Los fósiles se conservaron como impresiones y compresiones...
Se describe una nueva especie de leguminosa fósil del Neógeno en el noroeste de Argentina. La buena preservación de los tejidos y los caracteres diagnósticos presentes en el leño permitieron su clasificación a nivel específico. Gleditisioxylon riojana nov. sp. (Caesalpinoideae) presenta los siguientes caracteres diagnósticos: anillos de crecimiento marcados, porosidad semicircular, punteaduras ornamentadas,...
The early middle Miocene biota from the Shanwang locality in eastern China is one of the most diverse and well preserved in the world. This overall richness contrasts with its low diversity of anuran amphibians. The most abundant anurans are representatives of the family Ranidae, which remains the dominant group in the extant anuran fauna of China. Besides Rana basaltica Young, some other ranids can...
The base of the Furongian Series in the Sino-Korean Block has not been clearly defined due to the lack of the index taxon, Glyptagnostus reticulatus. The Sesong Formation of the Taebaek Group, Taebaeksan Basin, Korea, has been known to range from the Guzhangian Stage of the Cambrian Series 3 to the middle Furongian Series, hence embracing the base of the Furongian Series. Silicified polymerid trilobites...
The Upper Jurassic Morrison Formation has yielded some of the most important, voluminous and diverse dinosaur bonebeds in western North America, yet many of its historic sites were excavated during the celebrated period of vertebrate paleontology in western North America referred to as the first and second “Great Dinosaur Rush” (1870–1910s). Because of the large quantity of fossils collected during...
Among the 14small mammal species from the early Miocene locality of the northern area of the Junggar basin (northern Xinjiang, China), four species are cricetids (Rodentia): unnamed species of Cricetodon and Eumyarion, and two new species, Karydomys debruijni nov. sp. and Megacricetodon beijiangensis nov. sp. Some aspects of the morphology of Cricetodon sp. are shared by Eucricetodon from the late...
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