FALERII NOVI: UNA NUOVA RICOGNIZIONE DELL'AREA MURATAI risultati di una ricognizione dell'intera parte murata della città romana di Falerii Novi vengono presentati insieme a quelli di una piccola area posta al di fuori delle mura. I metodi impiegati consistono in una integrazione di rilevamento topografico, ricognizione a piedi dell'area ed estensivo uso di un gradiometro ‘fluxgate’. I risultati permettono di ricostruire in dettaglio una nuova pianta della città, che viene presentata in questo articolo, insieme ad una dettagliata descrizione delle strutture messe in luce, che includono un foro di dimensioni sostanziali, un teatro ed un portico, una serie di templi e una varietà di case private. Sebbene in maniera preliminare, questi edifici vengono discussi nel loro contesto, anche in considerazione dei nuovi dati che questa ricognizione ha fornito sullo sviluppo della topografia e delle difese della città.

Lapis Gabinus is a durable volcanic stone originally exploited and employed in construction at the ancient Latin city of Gabii. From the second century BCE it was also exported to Rome, where it appears in a series of important monuments, including the Tabularium and the Forum of Augustus. It is a lithified hydromagmatic-surge deposit erupted about 285,000 years ago by the Castiglione Crater, 20 km east of Rome, and is similar in appearance to other local rocks that geologists and archeologists often call "peperino". In the present study we establish geochemical identification criteria to classify this rock and distinguish it from the other "peperini" employed by Roman builders. To this end, we have performed trace-element analyses on 17 samples of Lapis Gabinus collected from outcrops at Gabii, and on 11 samples representative of the other "peperino" stones occurring in the area of Rome. The resulting reference dataset has been employed to construct discrimination diagrams in which the geochemical compositional fields of the different rocks are defined. We then tested this identification method by plotting in these diagrams the trace-element compositions of 16 archeological samples of "peperino" stones collected from the buildings of ancient Gabii and Rome, spanning the sixth century BCE through the first century CE. Our results show that the three most common such stones (Lapis Gabinus, Lapis Albanus, Tufo del Palatino) have distinct trace-element compositions and can be readily distinguished using the proposed discrimination diagrams. This relatively simple and inexpensive identification method can be successfully extended to other archeological research on volcanic materials and employed for wider petrographic purposes.

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The Tiber valley is a prominent feature in the landscape of ancient Rome and an important element for understanding its urban development. However, little is known about the city’s original setting. Our research provides new data on the Holocene sedimentary history and human-environment interactions in the Forum Boarium, the location of the earliest harbor of the city. Since the Last Glacial Maximum, when the fluvial valley was incised to a depth of tens of meters below the present sea level, 14C and ceramic ages coupled with paleomagnetic analysis show the occurrence of three distinct aggradational phases until the establishment of a relatively stable alluvial plain at 6–8 m a.s.l. during the late 3rd century BCE. Moreover, we report evidence of a sudden and anomalous increase in sedimentation rate around 2600 yr BP, leading to the deposition of a 4-6m thick package of alluvial deposits in approximately one century. We discuss this datum in the light of possible tectonic activity along a morpho-structural lineament, revealed by the digital elevation model of this area, crossing the Forum Boarium and aligned with the Tiber Island. We formulate the hypothesis that fault displacement along this structural lineament may be responsible for the sudden collapse of the investigated area, which provided new space for the observed unusually large accumulation of sediments. We also posit that, as a consequence of the diversion of the Tiber course and the loss in capacity of transport by the river, this faulting activity triggered the origin of the Tiber Island.