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Terrenato, Nicola
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- PublicationRestrictedA Previously Unidentified Tuff in the Archaic Temple Podium at Sant'Omobono, Rome and its Broader Implications(2019)
; ; ; ; ; ; ; ; ; ; ; This study reports on the discovery that the podium of the archaic temple in the Forum Boarium of Rome was built with a previously unknown tuff, of non-local origin. On the basis of detailed comparative petro- graphic and geochemical tests, it has been established that the blocks employed to build the earliest temple so far discovered in Rome belonged to a distinctive facies of tufo lionato that had never been characterized before, in contrast to what was reported by previous excavators. The blocks must have come from a quarry in the Anio River Valley, several kilometers from the construction site, making the Sant'Omobono temple the earliest known Roman building that extensively employed imported materials. The metrology of the blocks is also unique. This particular volcanic stone was probably chosen for its much greater resistance to weathering compared to the local tuffs, a trait that was essential in the flood-prone location, not far from the Tiber riverbank, where the temple was situated. The labor-intensive sourcing may also explain the dainty size of the temple podium in comparison to other sixth-century bc temples in the region. The choice made by the builders indicates far greater sophistication and technical awareness than they have generally been credited with. The new discovery is placed in the context of the quickly accumulating archaeological record of sixth-century bc Rome, which suggests a dramatic increase in the number and scale of monumen- tal projects in the expanding city.64 2 - PublicationOpen AccessRome in its setting. Post-glacial aggradation history of the Tiber River alluvial deposits and tectonic origin of the Tiber Island(2018)
; ; ; ; ; ; ; ; ; ;; ; ;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.343 26 - PublicationOpen AccessTectonics and fluvial dynamism affecting the Tiber River in Prehistoric Rome(2022)
; ; ; ; ; ; ; ; ;; ; ; ;Geomorphological investigations in Rome’s river valley are revealing the dynamism of the prehistoric landscape. It is becoming increasingly apparent that paleogeographic conditions that defined Rome in the historical era are the product of changes since the Bronze Age, which may be the result of local fault activity in addition to fluvial dynamism. Through a dedicated borehole chronostratigraphic study, integrated by 14C and archaeological dates, and paleomagnetic investigations, we offer here new evidence for fault displacement since ca. 4500 years/BP. We present the failure of the sedimentary fabric of a clay horizon caused by liquefaction processes commonly linked with seismic shaking, interpreting an (ca. 4 m) offset to signify the existence of a fault line located at the foot of the Capitoline Hill. In addition, we show evidence for another (ca. 1 m) offset affecting a stratigraphic horizon in the river channel, occurring along another hypothesized fault line crossing through the Tiber Valley. Movement along this fault may have contributed to a documented phase of fast overflooding dated to the sixth century BCE which eventually led to the birth of the Tiber Island. The most plausible scenario implies progressive deformation, with an average tectonic rate of 2 mm/year, along these inferred fault lines. This process was likely punctuated with moderate earthquakes, but no large event necessarily occurred. Together, the available evidence suggests that during the early centuries of sedentary habitation at the site of Rome, active fault lines contributed to significant changes to the Tiber River valley, capable of challenging lowland activities.242 11