HANNIBAL GONE ASTRAY? A CRITICAL COMMENT ON W. C. MAHANEY ET AL.: ‘THE TRAVERSETTE (ITALIA) ROCKFALL: GEOMORPHOLOGICAL INDICATOR OF THE HANNIBALIC INVASION ROUTE’ (ARCHAEOMETRY, 52, 1 [2010] 156–72)

For a long time now, historians have considered the way across the Col de Clapier as the most likely invasion route of Hannibal's army across the Alps. Mahaney et al. challenge this view by introducing a two‐tier rockfall into the discussion, which they believe is mentioned in the ancient texts and has gone unnoticed by modern scholars. Since a deposit of this kind can only be found at the Col de la Traversette—and there alone—Hannibal's crossing of the Alps, so they reason, must have followed this alternative route. However, a critical reassessment of the ancient texts and a closer look at the geomorphological situation clearly show that this interpretation is unwarranted.     

HANNIBAL'S INVASION ROUTE: AN AGE‐OLD QUESTION REVISITED WITHIN A GEOARCHAEOLOGICAL AND PALAEOBOTANICAL CONTEXT

The point of Hannibal's departure from New Carthage in Iberia, in 218 bc , and his subsequent march along the Mediterranean coast to the Pyrénées and on to the Rhône Basin, has been reconstructed by ancient historians with considerable accuracy. The latter 400‐km phase through the Alps, however, has been the subject of some controversy as to whether the Punic Army followed a southern versus a northern invasion route, or some intermediate variant. What is certain from the ancient texts is that Hannibal was trapped by Gallic tribes in a large defile—a gorge large enough to hold the entire army—along the approach to the high col of passage on to the Po River Plains of northern Italia. The entrapment involved an enfilade attack planned by an unknown Gallic commander, a military operation that nearly decimated the Punic Army. Previous arguments as to the location of the defile have hinged on inconclusive topographic, geological and geomorphic assessments. New data from palaeobotanical reconstruction of the northern approach route show the Gorges de la Bourne and the Gorge du Bréda, astride the Isère River, to have been forest covered during the invasion, which would have made the Gallic assault impossible. The existing evidence argues for a southern route, the approach through the narrow defile of the Combe de Queyras, with passage over the Col de la Traversette, as argued by Sir Gavin de Beer nearly a half century ago. Narrowing the approach route focuses on sites worth geoarchaeological exploration.     

THE TRAVERSETTE (ITALIA) ROCKFALL: GEOMORPHOLOGICAL INDICATOR OF THE HANNIBALIC INVASION ROUTE*

Numerous small, low volume rockfalls around the crest of the Italian and French Alps, principally formed from calcareous mica schist and metabasalt, have impeded travel across the major cols for millennia. As documented by Polybius and Livy in the ancient literature, Hannibal's Army was blocked by a two-tier rockfall on the lee side of the Alps, a rubble sheet of considerable volume that delayed his exit into the upper Po River Country. An in-depth study of the possible cols reveals that the only such two-tier landform lies below the Col de la Traversette, at ∼2600 m above sea level. In addition, it represents a problem in applied geomorphology, namely, to accurately determine the nature of the surface rubble sheet in Hannibal's time (218 bc ). A reconstruction of the initial deposit, likely Late Glacial, following the retreat of the Po Glacier, is based upon an analysis of the source rock and geological setting. Further specifications on the geometry of the Neoglacial cover sediment are based on weathering characteristics, lichen cover and soil development. The 'myth' that Hannibal fired the rockfall to comminute boulders is plausible given the vegetation records which support tree growth nearby, but is unsubstantiated by the lack of any carbonized rock.     

THE SEARCH FOR THE ORIGIN OF BITUMEN EXCAVATED FROM ARCHAEOLOGICAL SITES IN THE NORTHERNMOST ISLAND IN JAPAN BY MEANS OF STATISTICAL ANALYSIS OF FI–MS DATA*

The origin of bitumen excavated from archaeological sites in Hokkaido, the northernmost island in Japan, was sought by means of field‐ionization mass spectrometry (FI–MS) and gas chromatography – mass spectrometry (GC–MS) of the hydrocarbon components. The field‐ionization mass spectra were decomposed by Z‐numbers into several components, where the Z‐number refers to z in the formula C _n H _2n+z . This is equivalent to the deficit number of H atoms, when compared to the corresponding saturated hydrocarbon, which is related to the number of saturated hydrocarbon rings in alkanes. By use of the spectral intensities of the seven alkane components in each sample, multiple discriminant analysis was employed for the data of raw bitumen samples and excavated samples from archaeological sites. Based on this method and the gas chromatogram type, the following bitumen trade in the prehistoric age of Japan was elucidated: bitumen from Niigata, one of the main sources on the main island of Japan, spread to the north in 2000 bc , probably via the coastal zone, and reached a small island near the north end of Hokkaido. Bitumen from Sakhalin reached the central lowland in Hokkaido, but it went no further. Bitumen from Akita, another main source on the main island, spread over northern Honshu much earlier and reached the Oshima peninsula, the southwestern part of Hokkaido. The Akita bitumen scattered into the central lowland after the Niigata and Sakhalin bitumen. This area is believed to be the place where people from the south and the north met in those periods.     

Reconnaissance of the Hannibalic Route in the Upper Po Valley,Italy: Correlation with Biostratigraphic Historical Archaeological Evidence in the Upper Guil Valley,France

Controversy over the alpine route taken by the Hannibalic Army from the Rhône Basin into Italia in 218 bc (2168 cal bp ) has raged amongst classicists for over two millennia. Because Hannibal crossed the Alps, the significance for identifying the route taken by the Punic Army lies more in its potential for identifying sites of historical archaeological significance than a resolution of one of history's most enduring questions. While compelling stratigraphic, geochemical and microbiological evidence has been recovered from an alluvial floodplain mire in the upper Guil Valley, located below the Col de la Traversette (about 3000 masl) on the French–Italian border, it potentially identifies the invasion route as the one originally proposed by Sir Gavin de Beer in 1974. The dated layers in several sections, termed the MAD (mass animal deposition) beds based on disrupted/churned bedding and key/specialized biological components strongly supports de Beer's thesis that Hannibal chose the highest transit col into Italia. In addition to other physical evidence, we present here new physical, geomorphological and stratigraphic evidence, all calibrated by radiocarbon dating, that suggests Hannibal's imprint on the landscape exists in coalescing alluvial fans in the upper Po catchment of northern Italy.