An unusual theropod frontal from the Upper Cretaceous of north Patagonia

Paulina-Carabajal, A. & Coria, R.A. 15.4.2015. An unusual theropod frontal from the Upper Cretaceous of north Patagonia. Alcheringa 39, 514–518. ISSN 0311-5518

We report an isolated left frontal (MCF-PVPH 320) corresponding to a medium-sized theropod dinosaur from the Portezuelo Formation (Coniacian) of northern Patagonia. It shows a unique combination of traits that are not present in any other known Cretaceous theropod from South America. MCF-PVPH 320 is robust and anteroposteriorly short, with a flat and smooth dorsal surface largely excavated by the supratemporal fossa. Endocranially, the olfactory bulb impression is elongate, and the olfactory tract impression is markedly shortened anteroposteriorly. MCF-PVPH 320 differs greatly from the frontals of Late Cretaceous theropods, such as abelisaurids, megaraptorines and carcharodontosaurids. In contrast, character states including the thickness of the bone, V-shaped frontoparietal suture, reduced participation on the orbital margin and markedly short olfactory tract impression suggest the presence of an unknown mid-sized to large allosauroid for the Portezuelo Formation.

Ariana Paulina-Carabajal [a.paulinacarabajal@conicet.gov.ar], CONICET-Museo Carmen Funes, Av. Córdoba 55 (8318), Plaza Huincul, Neuquén, Argentina; Rodolfo A. Coria [rcoria@unrn.edu.ar], CONICET-Instituto de Paleobiología y Geología, Universidad Nacional de Río Negro. Av. Roca 1242 (8332), Gral. Roca, Río Negro, Argentina.     

古玉器的无损检测体系

目前古玉辨伪只是根据目视的经验来鉴别古玉材质。由于其种类繁多,产地各异,再加各种沁色,有时难以分辨真伪。10种无损检测方法的应用,根据客观的测试数据可以可靠地分辨古玉材的真伪。     

从北向南,穿越中国海

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An Iroquois frontier: the north shore of Lake Ontario during the late seventeenth century

Historical accounts and assessments of Lake Ontario's north shore during the late seventeenth century generally describe the area as an abandoned battleground and devasted “no-man's land”. The impression is built of English and particularly French views that this was an area no longer useful as a major source of furs. To the Iroquois the land was anything but devastated. Whereas they bypassed the territory in their constant search for furs to the north and west, the north shore, strategic and fertile, became a trading, agricultural, and even settlement frontier. A reassessment of the written documents and largely neglected maps of the period suggest that the Iroquois occupation of the north shore was highly ordered and based on traditional trade routes and tribal territorial claims. It was an extension of the homeland. But innovations in subsistence, settlement, and lifestyle did occur. The study of expansion to the north shore provides valuable insights into the delicate balance between the forces of change and continuity in post-contact Iroquois society.