Unexpected diversity of ratites (Aves,Palaeognathae) in the early Cenozoic of South America: palaeobiogeographical implications

Agnolin, F.L., July 2016. Unexpected diversity of ratites (Aves, Palaeognathae) in the early Cenozoic of South America: palaeobiogeographical implications. Alcheringa 41, xxx–xxx. ISSN 0311-5518.

Ratitae is represented in South America exclusively by Rheidae. Recently, the oldest purported fossil rheid, Diogenornis fragilis, was attributed by several authors to various other ratite clades. A new revision of museum fossil specimens from Argentina has resulted in the discovery of several ratite specimens that clearly do not belong to Rheidae, but resemble other clades. The newly identified specimens derive from Paleogene and Miocene strata. The great diversity of non-rheid Patagonian ratites ended via extinction of several groups by the late Miocene, probably owing to enhanced aridity that also favoured the dispersal of arid-adapted rheids. The new specimens described here reinforce the hypothesis that the traditional vicariant biogeographical model, which proposes ratite clades originated exclusively before the breakup of the Gondwana supercontinent, is questionable owing to the unexpected diversity of various ratite clades in South America, and also in Europe and Africa. This might indicate that the history of Ratitae was more complex than previously envisioned.

Federico L. Agnolin* [fedeagnolin@yahoo.com.ar], Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Av. Ángel Gallardo, 470 (1405), Buenos Aires, Argentina. *Also affiliated with: Fundación de Historia Natural ‘Félix de Azara’, Departamento de Ciencias Naturales y Antropología, Universidad Maimónides, Hidalgo 775 (C1405BDB) Ciudad Autónoma de Buenos Aires, República Argentina.     

Amarna and Uluburun: Reconsidering Patterns of Exchange in the Late Bronze Age

This paper sets out to combine the textual evidence from the Amarna letters with the archaeological evidence from the Uluburun shipwreck. The latter was most probably a Levantine vessel carrying an extraordinary quantity of commodities and prestige objects from Egypt and the Near East to a major palatial centre in the Aegean. Most of the scholarship has therefore taken the view that it represents an exchange of the same type as those described in the Amarna letters, and that the Aegean world should be inserted in the same system of diplomacy and gift exchange as the Near Eastern polities. What this scholarship has failed to acknowledge, however, is the fact that the Amarna letters do not contain a single mention of the Aegean. This paper, therefore, addresses this significant discrepancy between the textual and the archaeological evidence and argues that the texts and the shipwreck may be part of two different phenomena.     

Reliability-based Strength Amplification Factors for Structures with Asymmetric Yielding

A reliability-based methodology to estimate strength amplification factors for structures with asymmetric yielding is proposed. The approach is based on structural demand hazard analyses. Nonlinear time-history analyses of tridimensional simplified systems are carried out. The effects of two orthogonal components of the seismic ground motions and soil-structure interaction, are considered. Results show that the expected ductility demand of systems with asymmetric yielding may be much higher than those of symmetric systems. A simplified mathematical expression (which is function of the ratio between the fundamental vibration period of the system and that of the soil, ductility demand, and level of asymmetric yielding) is proposed to estimate the amplification factors. The expression is applied successfully to a 9-story reinforced concrete building exhibiting asymmetric yielding produced by tilting.     

Euganean trachytic grinding stones in the Caput Adriae from the Iron Age to the Roman period: Reassessment of the Protohistoric quarries

A group of Euganean trachytic grinding stones from Slovenia and the available data about the same type of artefacts in the whole Caput Adriae are presented. The occurrence of Iron Age saddle querns in Karst and Istria is confirmed, but our study suggests a likely provenance from Mts Cero/Murale instead of Mts Altore/Rocca Pendice, as previously suggested. Este, an important Venetic centre, is just south of Mts Cero/Murale, suggesting its central role in the production and distribution of saddle querns. During the Roman period Euganean trachytes are still used for rotary millstones, but new quarries (Mt Rosso), relatively close to ancient Padua, are exploited. Such shift in the position of millstone quarries most probably reflects the changed geopolitical framework.     

Polished Stone Axes in Caput Adriae from the Neolithic to the Copper Age

This paper reports the results of a long-term project on the stone axes from Caput Adriae. Available data show that jade axes originating in the western Alps reached the Neolithic groups of Friuli Venezia Giulia and coastal Istria as early as the second half of the 6th millennium BC, during the Danilo/Vla?ka culture. The exchange of this and other classes of lithic artefacts testifies that in this period this area was fully integrated into long-distance exchange systems that used mainly coastal routes. These systems would have continued in the 5th millennium BC, as indicated by a few oversized jade axe blades and other materials. Far from the coast, jade axes entered central Slovenia, probably reaching sites of the Sava Group of the Lengyel culture in the first half of the 5th millennium BC. In roughly the same period, shaft-hole axes made of Bohemian metabasites (BM) spread over central and southeastern Europe, crossed the Alps and reached Italy. According to different Neolithic traditions, during the 5th millennium BC Europe appears to be divided into a jade-using western area and a central-eastern BM-using one. During the 4th millennium BC, the exchange networks of Caput Adriae are increasingly influenced by the eastern Alpine and Balkan world, where the raw material sources of the main groups of shaft-hole axes are located. The association of the rocks used for axe production and copper ore suggests that the changes in raw material exploitation strategies during the Copper Age were probably related to the development of the first metallurgy.     

Early Islamic pigments at Nishapur,north-eastern Iran: studies on the painted fragments preserved at The Metropolitan Museum of Art

Pigments appearing on ninth–twelfth-century AD-carved stucco, wall painting, and terracotta friezes excavated at Nishapur in north-eastern Iran were investigated by optical reflectance spectroscopy, micro X-ray fluorescence spectrometry (μ-XRF), X-ray diffractometry (XRD), micro-Raman spectroscopy (μ-Raman), and scanning electron microscopy (SEM). Many of the pigments identified including vermilion, red lead, hematite, limonite, carbon black, atacamite, calcite, and gypsum have been identified in previous studies of pigments used in later Islamic periods. However, a series of unusual pigments such as wulfenite, pyromorphite, phoenicochroite, and jarosite were also found in the present study. The association of kaolinite and alunite with limonite and other Fe-bearing yellow pigments points to a local provenance for these pigments. In addition, the presence of orpiment in the vermilion may be indicative that the vermilion was artificially manufactured. These findings suggest that pigment use and manufacturing during the ninth to eleventh centuries in Nishapur was still in a trial-and-error stage and the palette known from the twelfth century onwards had not yet been systematized.