We present a timeseries of 14CO2 for the period 1910–2021 recorded by annual plants collected in the southwestern United States, centered near Flagstaff, Arizona. This timeseries is dominated by five commonly occurring annual plant species in the region, which is considered broadly representative of the southern Colorado Plateau. Most samples (1910–2015) were previously archived herbarium specimens, with additional samples harvested from field experiments in 2015–2021. We used this novel timeseries to develop a smoothed local record with uncertainties for “bomb spike” 14C dating of recent terrestrial organic matter. Our results highlight the potential importance of local records, as we document a delayed arrival of the 1963–1964 bomb spike peak, lower values in the 1980s, and elevated values in the last decade in comparison to the most current Northern Hemisphere Zone 2 record. It is impossible to retroactively collect atmospheric samples, but archived annual plants serve as faithful scribes: samples from herbaria around the Earth may be an under-utilized resource to improve understanding of the modern carbon cycle.

New evidence allows us to demonstrate that a regional trade connected North Syria with both central Anatolia and Babylonia well into the 17th-Century bc. Archaeological evidence indicates that a specific type of vessel, the globular flask, was produced at Zincirli Höyük in the mid-17th century for the purpose of storing and transporting wine. The simultaneous appearance of these vessels as far afield as Kültepe and Sippar-Amnānum lines up with Late Old Babylonian attestations of alluḫarum-pots in 17th-c. texts from Sippar, Babylon, and Dūr-Abiešuḫ. These, we argue, must refer to the same vessels called aluārum in earlier Old Assyrian texts from Kültepe from the 19th century. Taken together, this evidence points towards the existence of a previously unsuspected trade network centered on the ancient Syrian state of Mamma that thrived in the decades between the collapse of the Old Assyrian Trade Network and the accession of Hattušili I. Through a dialogue between textual and archaeological materials, we are not only able to reveal the persistence of long-distance exchange for a century previously believed to lack it, but provide more context for the political transformations taking place at the end of the Middle Bronze Age.