Fig 1.
The map shows the site of the excavation in Rome, between the ancient Aurelian walls (marked by a black line) and Rome’s Metro line C (underground railway line), near the Basilica of San Giovanni in Laterano. Map sourced from http://dati.lazio.it/catalog/it/dataset/carta-tecnica-regionale-2002-2003-5k-roma. On a map of ancient Rome at the bottom right corner, the excavation site is indicated by a red dot.
Fig 2.
The foundation of the portico.
Schematic section of the foundations of the south-eastern lateral portico (u.s 1141–1178) [26].
Fig 3.
At the bottom right, axe marks are visible on the planks [26].
Table 1.
Samples from the archaeological excavation.
Fig 4.
Visual comparison of all dated individual Roman oak TRW series (A), and of the mean “Rome Metro Site Chronology” (RMC1, in red) with the “Moissey-La Tuilerie Site Chronology” (B) from the French Jura, demonstrate the highest correlation values for the year 40 CE (TBP = 6,57, Glk 64,40***, see Table 3).
Table 2.
Dendrochronological correlation values of each individual TRW series against the mean chronology of all other samples.
Fig 5.
Map of Roman provinces in today’s France and Germany, with the probable provenance of the Roman oak Metro samples. Some important Roman towns are indicated (Colonia Agrippina = Cologne; Augusta Treverorum = Trier; Divodurum = Metz; Dorocortorum = Reims; Augustobona = Troyes; Lugdunum = Lyon; Arelate = Arles; Aquae Sextiae = Aix-en-Provence and Massilia = Marseilles), as well as the regions where the reference chronologies (Table 3) come from and also the rivers (Saône and Rhône) leading to the Mediterranean Sea. Map sourced from https://mapswire.com/europe/.
Table 3.
Correlation values of the Rome Metro Site Chronology (RMC1) in comparison with European reference chronologies for the year 40 CE.